Some of these responses seem very odd to me.

There must be something going on that i am not aware of.
Why this thread, or others like it would cause the death of The Forum is beyond me.
I am not sure if i have even read this entire thread...but i thought the purpose was to discuss WHY a person does or does not like a certain camera.
That scenario is ONE of the reasons a forum like this exists.
Gear, is a HUGE talking point.....whether it be guitars, cars, guns or cameras.
On the other hand, if you Guys/Gals are saying there is a divide, name calling, or choosing of sides.....where a person that prefers an SLR is a "loser"...or behind the times, stuck in the past, Etc etc.......i can understand the problem. I am not aware of that going on here, but i am new to this place.
Anyway.....at the risk of repeating myself. I said the no mirror is.......Relatively New. I am not saying they just started selling 3 years ago.
However, compared to the SLR, beginning with the Nikon F.....the arena of 35mm camera sales have been dominated by the SLR until...once again...relatively recently. The no mirror had teething problems with heat and reliability, they had catching up to do with glass, etc etc.
Whatever "problems" they might have had at one time, i would say they have well conquered circa 2018.
I would think (until a new technology takes their place) that no mirror 35mm will dominate the "Professional" camera market for the foreseeable future.
If i somehow gave the impression that i was down-talking or doubting the legitimacy of no mirror cameras, i apologize.
FWIW.......I do not even own a digital camera. I have no bias one way or the other where Mirror Vs No Mirror is concerned.
I shoot film because i am an older person, i already have those types of cameras; and as a hobby, film allows you the unique opportunity to print.
Other than for myself, I do not think film is "better" than digital or any other format.