Like, it's fun to whine about the imperfection of macOS...versus Windows or Linux? LOL, come on. And just like you and probably everyone else on here, I use macOS, Windows and Linux every single day. Pretending that a couple of aesthetic changes are the big "straw that broke the camel's back" is just so lame.
It is hysterical. It's noisy nonsense. This "fine this is it" tantrum that people pull is such a tired gimmick.
And personally I think the aesthetics of macOS/iOS/iPadOS 26 are terrible. They're inevitably going to start easing down the heinous translucency and will claw back on the stupid round corners. Aside from that the system has a lot of fundamental improvements that will benefit everyone.
But no, no one on Sequoia is going to suddenly be without apps or extensions. When apps start abandoning versions it's usually a couple of versions out.