It’s a mix - for years I wanted root on my iPhones, just like you got on android. In practice, once I had it…? I never did much beyond installing Cydia.
With today’s hardware I might have a different take - the 18 has more than enough hardware to be a laptop so maybe I’d use it for a docking mode. But my gut is I’d probably still want a laptop even then.
To me the upshot is : billions of development, software and hardware, have gone into the platforms - it’s hard to quickly make them significantly better.
When I owned an iPod touch, the advantage of jailbreaking was to give your device certain features that the OS just didn't support. (Hell, I remember early days when iOS didn't even have a concept of wallpaper, the background was just black.)
iOS has come a long way since those days so a lot of the most common use cases of the past are no longer necessary. But the principle is the same - the hardware is a general-purpose computer but the software is locked down unnecessarily in many ways. Jailbreaking lets you do things that are outside of Apple's box.