No, the beautiful ordinance doesn't have an affect. In fact, if anything, it improves your chances of getting hybrids because with the beautiful ordinance enacted, you can just water the flowers you're trying to breed. Which means a higher chance that those flowers will spawn a hybrid.
TT'ing does not shrink your tree whatsoever.
It makes you lose villagers if you TT carelessly, but if you do it cautiously, there's not a thing to worry about.
But anyways, I agree that you should do whatever you want. If you're not comfortable with doing it then don't, but if you want try a different way of playing the game, go for it. c: