My opinion is that there is no downside to having a 1x. Many times, my drive rings have thrown a chain and switching to a 1x set up, I have never thrown a chain yet. Then there is the simplicity of only thinking about being in the right gear on the cassette, which shifts fast compared to the front derailleur. Weight weenies could claim a weight loss, but I doubt it is worth consideration.
Basically, one less thing to go wrong and think about while on a ride. I love my 1x11