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SLRs died. Much the same way rangefinders died.
Remember, the first popular compact film cameras were rangefinders or fixed focus "point and shoots". The SLR was originally a solution to a few exotic applications.
Rangefinders didn't work well with long lenses. They didn't work well closeup, and were essentially useless for macro. Leica had a very broad rangefinder lineup, including accessories like the Viseoflex, which was essentially an SLR viewing system that sat between the camera and a long telephoto lens or macro lens.
The first SLRs were awkward. The finder went black after you shot, and stayed black until the next time you cocked the shutter. The SLR that popularized the instant return mirror, the "Asahiflex" that later became "Pentax" didn't appear until 1954.
- Mirror vibration and noise in early models was horrendous.
- They were heavy.
- Flash sync speeds were terrible, like 1/30 sec.
- The finders were dim, and the focus aids were terrible.
- They forced compromises in wide and normal lens designs.
People shot them because they were enablers for certain types of photography, but they sure didn't want them.
The EVIL (aka "mirrorless") solved a lot of the tradeoffs of the SLR, and gave people back the things the SLR took away from the shooting experience. Yes, the first EVIL cameras were crude, but so where the first SLRs, and so were the first rangefinders.
SLRs had hit many walls. Flash sync speeds were about as good as they'd ever get. We were pretty much at the limits of technology for shooting speed. Finders still sucked.
Because the EVIL camera is so much a computer, it's benefiting from the rapid advancements in computer technology.
- Flash sync speed went 1/30 sec on slow rolling shutters, to 1/250 sec on cameras with enough speed for a very fast roll like Nikon Z9, to 1/1000 sec on global shutter cameras like the Sony A9 III.
- AF zones cover the entire screen, not the 1/4 to 1/9 of the screen area like a DSLR.
- Finders got more and more versatile. I recently observed that the Nikon Z9/Z8 had the equivalent of every interchangeable finder offered for the Nikon F3, F4, F5 "system" SLRs built in. Reduced magnification "high eyepoint" or "sports" finders. Magnifying "chimney" finders. Waistlevel finders.
- Finder latency gets better every year, and we're seeing "blackout free" finders like Z9 now.
- Then there's little things, like being able to compose in B&W, 100% viewfinder coverage even on entry level cameras, etc.
They just keep getting better.