While the Stage Manager feature, which is growing on me, won’t be available on non-M1+ iPads, you can apparently try it on other devices using Xcode’s iPadOS simulator. That’s exactly what 9to5mac did, so if you’re curious as to how Stage Manager would look on an iPad mini, head over there for some screenshots.
Apple isn’t happy with Stage Manager’s performance on non-M1 iPads, which is the official explanation as to why only iPad Pros (not counting the 2018 models) and the latest iPad Air gets Stage Manager. There’s probably something else there, too because Stage Manager definitely works best on larger screens. I’ll have more on that soon, but suffice to say, I’m not seeing any real benefit of running Stage Manager on an iPad mini, for example, even if it was snappy enough. The screen’s just too small.