Why dharma is non negotiable for a vedantin, even from knowledge point of view

For a vedantin the understanding of ‘jagath mithya’ is equated to the understanding that ‘jagat is ishvara’ or isavasyam sarvam idam.

This is really the pinnacle of vedantin, the knowledge that all that is here is ishvara svarupa.
Dharma is ishvara. In the way the individual relates to the world, the individual has to recognize the presence of dharma, therefore actions must confirm with dharma.

Dharma means to act appropriately in a situation. Do do what is to be done, and to avoid what is not to be done. Since in all of waking state, man is either engaged in action or inaction, strictly speaking dharma governs every single moment of ones waking state, one has to either choose to do the right action, or else avoid a particular action. ( this perhaps means no procrastination)

Now unless a vedantin commits oneself to dharma, the gnanam does not stand firm. The reason being, a vedantins actions when not in conformance with dharma, are in opposition to the knowledge itself, which affirms that what is here is ishvara. Adharma is possible only from the point of view of the karta. To the vedantin who has assimilated that akarta is the truth and any actions appear to be so only due to the three gunas , which is ishvara, really speaking, there is no karma. There being no karma, there is no possibility of adharma as well. So what the gnani does, is dharma (from standpoint of agnani, since from the gnanis standpoint there is no karta karma etc. really speaking) , gnani being akarta. That is why we as a civilization have always taken advice on what needs to be done, from great gnanis and mahatmas.
The attempt of a mumukshu is to assimilate the vision of Vedanta, that ‘aham akarta, abhokta’, and till that vision is firmly held one must deliberately avoid adharma through purusharta nishchaya, which is sheer determination and effort. There is no shortcut around it.

Typically calling out , the neo vedanta wherein, this isnt affirmed. the new vedantin person says I am akarta, so doesnt matter what I do. We have heard instances where some guru fools his disciples / exploits and then says , I didnt do any of this. Really speaking this is a form of self delusion. If you are saying it doesnt matter what you do, you are already a doer. Understanding that I am non doer, can only be deemed complete with the firm understanding that action itself is impelled off the gunas as well as the prarabdha which is in essence ishvara or mithya. And what is satyam is the non doer. We cannot bypass ishvara and reach satyam, since satyam is ishvara alone, there doesnt exist an alternate satyam. And we cant understand ishvara without acknowledging dharma, since for the karta, dharma IS the primary introduction to ishvara.
Saying bye to dharma is like entering the building called ishvara ( 5 star hotel), meeting the watchman and saying hi to him and leaving. Saying, I have seen the watchman, i know what the building is now. One has to enter the building. Stay in there for a while and for that one has to keep the watchman happy to be able to continue the stay. Only after staying in the five star hotel of ishvara for a while, does he gain the necessary vairagya, viveka and atma bala to assimilate brahma gyanam. And for that one has to follow the rules of the 5 star hotel, otherwise the watchman will get you. This is dharma.
hara namah parvati pataye
hara hara mahadeva