Two types of gyms???
Would have it been so hard for Niantic to keep the old gyms and pop up these new ones so you keep your power house players happy along with mid level to weak players happy with these new gyms.
Answers
I would have liked to keep the old level 10 gyms too, but impose two of the new rules: 'only one of a kind in each gym', and 'first in, first battled'.
Those, plus add the raids (which I like) and then see how it all settles in! .
(Hate having to feed berries too, as that really feels like work - and this is a supposed to be a fun game!).
My friend (a casual player), likes the new gyms since the battles are quicker and there's no more prestige (which he hated with a passion). For the hardcore players, Boss Raids seem more their thing now. Trying to solo a upper level boss impresses me more then keeping or tearing down a gym no matter it's level (10 or 6).
That gets old fast. Soloing a boss is simply impossible for some of them because they have more hps than you can take away in the time given. I barely even put a dent in a Blastoise by myself and you cannot get stronger grass pokemon than what I have. It is simply impossible to beat him with 1 person.