I think you can make choices that arise naturally or that we may gravitate towards or away from,or not, at any given point in life .Once you start imposing rules then you’re probably not as free as you think you are or would llike to be.
That said, i think alot of yoga is about self-control and exercising some discipline.
I’ve drank a coffee in the morning to wake up, then done some yoga perhaps an hour later.But better that than never.Personally i find when i start trying to impose rules left,right ,centre, in terms of a regular practice i think you can end up in a pickle.Must do jal neti before hatha yoga,must be perfectly relaxed & comfortable.There is no perfect situation,as such;This is idealised and it never usually happens that way .I’ve learnt to ditch the rules,or way too many of them at once, and just practice , if possible.Otherwise i say to myself-right iate too much there and and my devious side will play tricks & try to excuse itself.
P.S -You know that the first stock-exchange as such where merchants and traders conducted their business in the city of London was also the first coffee-house,when coffee was a really new thing and usually just an exclusive preserve of the rich.I walk by a Star bucks today and i smell that heady whiff & aroma and i sometimes can help viewing those customers as junkies, of a sort, imbibing their fix…lol
Howver yoga should’nt have dogma in it.Anyone should be free to do whatever they like.Nothing wrong with the finer things in life.Yoga tends to talk of moderation in all things which comes across as a balanced persepctive.It does’nt prescribe anything.