Your reply is very restrained considering the brutality of my answer. I don't know why I was so mean.I own three 5-Series bodies (II,III, and IV) and one 7-Series body (II). I owned my first FF body before I owned the original 7D (which I donated to the photography department of a local high school some time ago). I already had a 5D Mark III when I bought the 7D Mark II because, at the time, it was the only non 1-Series body in Canon's catalog with flicker reduction that revolutionized shooting under flickering stadium/gym lighting.
They're different tools for different jobs. When I'm shooting sports under the lights or indoors the faster handling APS-C body lets me get away with using the 70-200/2.8 I already own (and also use on the FF bodies for other purposes) instead of needing to pay $6,100 for an EF 300mm f/2.8 L IS II and still need a 70-200/2.8 on another body for when the action gets too close. I'm also using the 5D IV with a shorter zoom (24-70 or 24-105) or maybe even the 5D III with a 16-35 or 17-40 and the 5D IV with a 50mm or 85mm prime.
The EF 24-105mm f/4 L is legendary for taking any abuse one throws at it and just continuing to work and giving images that are more than good enough for low resolution newsprint or web distribution. That's something the original EF 24-70mm f/2.8 L could NOT do. Look at it funny while the barrel is extended and that lens needs a trip to CPS for realignment. If you are lucky, it will be worked on by one of the few technicians who actually know how to line one back up properly.
My m3, m5, and m6, as well as my gx5, were all great cameras for street photography, and I forget how much I liked them. I loved them all, being a waist shooter fan, because most had movable rear displays, which full frame didn't have at that time. My sigma quattro dp2 aps-c was cool too, a very unique looking camera with unique images.
Most street shooters supposedly prefer 35mm lens shot at f8, although I am a different type of street shooter: I prefer wide open fast lenses in 85mm for street work, and I prefer action isolation and narrow DoF.
I also notice that my RP has a build like a Rebel instead of a 6D, and it is already bent out of shape from heavy street use. So I can also see why some folks would buy a 7D with a magnesium metal body. My full frames were always tanks. I also remember times I considered an SL3 because I am addicted to miniature things, and that camera is tiny.
So ultimately I can see at least a FEW reasons APS-C could still be bought and it make sense.
Thank you for replying, and reminding me.
As for a 24-105, I would use one if it came my way, but I just can't take it seriously. My best friend is still using a 5D Classic and 24-105 v1, so maybe that is why I am so scornful of the lens. Her work could be so much better if she would upgrade at least that body.