Is it possible for Animate sites to have BACKENDS, like, PROPER ones, which DO something? Is that like, PHP or node,js or something, or is there some other, Adobe-certified tool?
yes, just like any other html5 site.
Is there anything like Adobe Generator used to be, for Flash, TODAY?
i don't know anything that converts flash swf files (or animate swf files for that matter) to web-ready files other than animate.