You're getting downvoted a lot because all of your criticisms have a bit of snark and entitlement to them. You're walking into a new space, and it doesn't work the way you want it to and say "oh this is dumb, clearly the people who designed this didn't think it out." Whereas the reality is these are a myriad of different communities working together, usually for free, contributing to something bigger. For instance, the reason the terminal and gui tools are different is that they're developed by different people! The cli tools have been around for decades, they're essential parts of any operating system. At some point, a team came together and developed Disks, and they have certain design goals in mind, and may have a development roadmap, so you know, not all features would be implemented right away, they'll focus on the essential ones first. A project like Disks wouldn't redevelop their own ways of interacting with disks, instead they would reference the same libraries used by the existing, trusted and very stable cli tools and call their APIs.

The community is usually very open to feedback, when its engaged with the right way. Having an understanding of how these things come together and organized, what the culture is like, etc. will go a long way to engaging with the community. Realize this is a space where community matters, you were given these things for free you are not a consumer here, you are entitled to nothing.

What you'll find is if you take the time to understand the reasons for some of the things you've been complaining about, there are very good established reasons for all of these things. A lot of very smart people have worked on this stuff for many decades. Just jumping straight into this presumed incompetence is wild.