What are your thoughts on powercreep: is it something you feel is maybe overstated? Does WotC worry about it too much?
Power creep is a problem that can be addressed with a lot of levers. You can print answer cards that keep power creep in control. You can can level out the power creep by reprinting existing cards at existing power levels instead of replacing them with worse cards. You can change the balance of spells vs creatures to rebalance power between them. You can come up with new mechanics that invalidate older strategies, reducing power creep by making cards not as good as they used to be in a new environment.
Instead of looking at the problem in a nuanced way, MaRo and crew are taking a blunt object approach and just hitting everything with a hammer. "Lands are too good, print crap lands! Bolt is too good, make a new Searing Spear reprint! Games are too fast, add 3 to the mana cost of the sets new ability! By God, I will kill the power level of this game no matter how many times I need to bash it over the head and no matter how many garbage cards I need to put in the set! I am infallible!!"
All that ends up doing is turning players off, driving pack value into the ground (seriously, look at the rares in Theros, how many people are going to be happy spending $4 on a pack and opening any of the horrible rares in the set? Everytime someone hands over $4 and opens up a Domestication worth 25 cents, I literally see Magic dying a little bit right in front of me), and make Magic that much less exciting/enticing/interesting/enjoyable.
I'm not saying every new card needs to be the next TarmoJace, or every pack needs a $30 mythic in it, but there's a balance here, and WoTC is WAY to far on the side of printing garbage.