Stepping onto the soap box....
Regarding iPadOS
I think the external storage support was the primary need for the iPad. However, we (users) should look at everything else differently. I don't think mouse support is necessary - if you need a mouse, you need another platform. Obviously I'm not the first to say that. Devices that are really, really good at one thing provide a much better experience than a generic tool that requires compromise to complete many things.
IMO, the demands should go towards program and app developers to design and build for the iPad instead of asking Apple to compromise experience.
Stepping down...
Regarding iPadOS
I think the external storage support was the primary need for the iPad. However, we (users) should look at everything else differently. I don't think mouse support is necessary - if you need a mouse, you need another platform. Obviously I'm not the first to say that. Devices that are really, really good at one thing provide a much better experience than a generic tool that requires compromise to complete many things.
IMO, the demands should go towards program and app developers to design and build for the iPad instead of asking Apple to compromise experience.
Stepping down...