It is dependant on one's hearing.
I find the 880 though to be very good. I've only found it sibilant on 2 of 1000+ tracks I've played through it, and they WERE terrible recordings. dt-880 is far more neutral than the 58x or the 600/650, to the point it can be boring to some. It does have less bass impact, but further extension than either of the three. NOTE: I use the 600 ohm DT880 Premium, which is the one with smoothest treble.
That said you're wrong about bass and gaming. Look at ninja, he wears the dt990 pro and he's one of the top 5 best fortnite players in the world. The headphone has been hailed for years as being great for FPS because the channels are easy to pick apart on that headphone. I also don't really find it sibilant for gaming, but it can be for 'some' music. It's still an excellent headphone. EDIT: bass also doesn't affect positional sound in a good headphone, even when it is very present. Your argument here isn't much of one. That aside, a lot of gamers want that "bass" for the immersive feel it brings, especially in certain games like FPS. I would concur, and gaming on bassy phones like the th-900 is perfectly natural. Hell even gaming on 12 dollar sony earbuds is fine, positional technology in games now is so good that even with buds with literally zero sound quality or soundstage I could accurately locate enemies in perfect 3d space.. Anything with an L and R channel will work fine for gaming in the modern day, though obviously better separation and a wide enough soundstage or 3d enough one will feel more natural. This is independent of the midrange though
My beyer bias is a running joke I have with myself, it's just because Beyer is objectively the best manufacturer in headphones. They offer amazing quality comfort/sound/price ratio products that are some of the best, and cheapest ways to get into hi-fi. Truely I'm unbiased when it comes to judging things off the way that they sound, however.
I would personally recommend the dt770/880/990 with the 880 being MY personal favorite, as well as the k712 (not k7xx!), hd650, and hd58x as the best entries into audiophile territory. All of them are great, some with better value for money (beyer) but I think one should make the purchase based on the use of the headphone, and genre of music most listened to.
For me it's jazz/classical and with mixed folk/edm, so the neutral 880 is obvious.
I really loved the 650 for years, but eventually got tired with how laid back it sounds. It always sounds good, just never has any emphasis other than it's mid coloration to bring a song to life. I found the ATH AD series was better at filling my mid needs.