Yep.
Not to mention Last Stand was the train wreck that put the franchise on its current peculiar path. Barring a reboot, there was no way to really "continue" past TLS in a satisfying way without something as circuitous as Days of Future Past.
It was Last Stand that (badly) killed off Cyclops, Xavier, and Jean, committed character assassination on Rogue, and "ended" the franchise, so as to have only spinoff prequels. In fact, if XOW hadn't been an even objectively worse movie, we might not have gotten something as good as XFC, as they were at the time hellbent on making David Goyer's second directorial effort after the masterpiece that is Blade: Trinity on "X-Men Origins: Magneto."
... I just don't get it. As disappointing as Apocalypse might be, First Class and Days of Future Past reinvigorated a the franchise with a bigger more comic book-y scope to this universe and its characters, undid the damage of X3/XOW, and paved the way to getting the A-list team back. The only other option would have been a hard reboot (which I guess some would prefer). Yes, in retrospect, Apocalypse should have been about the new students and not Bryan Singer running in a circle after his older movies. But even so, Apocalypse bridged us out of Singer's canon, and has now put the focus on Cyclops and Jean. Finally. But we're excited to reboot before we see what that looks like?
I actually think the Deadpool films and Logan and the First Class movies all complement each other into a much more interesting (if messy and continuity-splattered) franchise than where X3 and XOW left us. People just can't see past the nostalgia goggles.