Their genius isn't necessarily in being first or even inventing something (touch screen phone), it's tweaking the edges and getting it "just right".
I don’t want to be experimented on like the bleeding edge companies are doing constantly. I want something solid that works.
Of course it’s not perfect but the whole ecosystem integration and solidness is far far far above anything else out there.
For example I have a few iPad apps installed on my Mac, the reason being that I wanted keyboard/mouse and easier copying of content into and out of the iPad app while I was working on my desktop machine. With universal control I don't need to have the dual installs anymore, nor have to deal with the problems that would come with that (e.g. having to duplicate content across both installs).
There's also plenty of apps which the developer has barred from installing on macOS where this is the only real solution.
You can bypass that with iMazing. It’ll export the raw iPad app, which you can then install on your Mac, and it’ll probably run fine.