Puranic karmas are not Vedic karmas as per Yajur Veda.:~

Sage Sankara gave religious, rituals, and dogmatic instruction to the populace, but Advaitic wisdom only to the few who could rise to it. 

If you mix Advaitic orthodoxy with Advaitic wisdom, it creates confusion because they mix up the two viewpoints. Thus, they may assert that ritual is a means of realizing Brahman, which is absurd. 

Indulging in Non -Vedic rituals(Puranic Rituals) in place of Vedic rituals are enveloped in still greater darkness, in other words, they are extremely foolish, fall into an awful hell of pain and sorrow, and suffer terribly for a long time." 

Puranic karmas are not Vedic karmas as per Yajur Veda. The seeker of truth must know the difference between puranic karmas and Vedic karmas.  

The Puranic karmas are introduced to suit the mass mindset of that time, by the founders of present-day Hinduism by keeping the Vedas as their base. They also introduced a new modified belief system on Puranic GODS with anew code of conduct to revive the Vedic religion, which was in ruins in the hands of Buddhism and Jainism. 

Thus, present-day Hinduism with diverse beliefs is not the ancient  Sanatana Dharma or Vedic religion.

Thus, this hotchpotch ideology is the greatest obstacle in the realization of the ultimate truth. That is why Buddha rejected the Vedas.

Mundaka Upanishad condemns rituals:~ The Para or Higher knowledge is the knowledge of the Supreme Being while the Apara or Lower Knowledge is that of following sacrificial rites and ceremonies. (1/2/ 1 – 6)

Physical & mental disciplines such as Karma, Mantra Yoga, Yajna, Puja Japa Blind devotion to deity or Guru is not the tool for liberation or freedom from experiencing the dualistic illusion as a reality. It is a dualistic cult including Advaitic orthodoxy propagate this discipline. Such disciplines and code of conducts have no value if one is seeking ultimate truth or Brahman to get Nondualistic Self -awareness.

Mysticism, scriptural knowledge, and penance-based Scholasticism are a great hindrance to ‘Self –realization’. Inherited blind belief with corresponding actions based on scriptures, worship, ritual faith that imply certain mental and physical discipline, or scripture supporting the belief, faith, creed, ritual, theological knowledge personal or opinion leads to hallucinated knowledge. All these become a great hindrance in grasping, understanding, assimilating, and realizing the Advaitic or nondual truth.

Scriptural mastery including ancient Sastras, Tarka, and Samkhya disciplines to support Karmas & belief Bhakti Argument & interpretation with help of logic, grammar etc. to support beliefs, revelations, prayers etc. In addition, dogmas, theological or other based on authorities.

That is why Sage Sankara said:~ Neither by the practice of yoga nor philosophy, nor by good works nor by learning, does liberation come, but only through the realization that Atman and Brahman are one in no other way.(1) Vivekachoodamani v 56, pg~25

Sage Sankara says:~ The scriptures dealing with rituals, rewards are therefore addressed to an ignorant person.

Adhyasa Bhashya of Sage Sankara:~ As regards the rituals:~

Sage Sankara says that the person who performs rituals and aspires for rewards will view himself in terms of the caste into which he is born, his age, the stage of his life, his standing in society, etc. In addition, he is required to perform rituals all through his life. However, the Self has none of those attributes or tags. Hence, the person who superimposes all those attributes on the changeless, eternal Self and identifies Self with the body is confusing one for the other and is, therefore, an ignorant person. The scriptures dealing with rituals, rewards, etc., are therefore addressed to an ignorant person. - Adhyasa Bhashya

Sage Sankara:~ (11.1) This ignorance (mistaking the body for Self) brings in its wake a desire for the well-being of the body, aversion for its disease or discomfort, fear of its destruction, and thus a host of miseries(anartha). This anartha is caused by projecting karthvya(“doer” sense) and bhokthavya (object) on the Atman. Sage Sankara calls this adhyasa. The scriptures dealing with rituals, rewards, etc., are, therefore, he says, addressed to an ignorant person. - Adhyasa Bhashya

Sage Sankara:~ (11.2) In short, person who engages in rituals with the notion “I am an agent, doer, thinker”, according to Sage Sankara, is ignorant, as his behaviour implies a distinct, separate doer/agent/knower; and an object that is to be done/achieved/known. That duality is avidya, an error that can be removed by vidya. - Adhyasa Bhashya

Sage Sankara: ~ (12) Sage Sankara affirming his belief in one eternal unchanging reality (Brahman) and the illusion of plurality, drives home the point that Upanishads deal not with rituals but with the knowledge of the Absolute (Brahma vidya) and the Upanishads give us an insight into the essential nature of the Self which is identical with the Absolute, the Brahman. - Adhyasa Bhashya

Sage Sankara: ~ Atman, the Self is verily Brahman (God), being equanimous, quiescent, and by nature absolute Existence, Knowledge, and Bliss. Atman is not the body, which is non-existent itself. This is called true Knowledge by the wise. : ~ Santthosh Kumaar