I'm a big CLI user, but my primary gripe with these sorts of interfaces vs a GUI is when they have a huge number of nested sub commands. I often find myself searching through the tree of possibilities running --help on every single level just to do something simple. Especially if what I'm trying to do may exist in disparate sub commands. With a web interface there'd likely be some kind of nested menu or dropdowns that offer more of a sense of the overall arrangement at a glance.
I'm always happy to have access to the CLI to be able to script things, but if it's the only interface to a service with many features it can be awfully cumbersome.
Sometimes with these deeply nested do-it-all CLIs I feel like I'm playing a text adventure trying to navigate a maze, constantly typing /look and /examine. Often these tools have so many sub commands that a man page is not helpful if it exists at all.
> cloud-tool --help
...
> cloud-tool instances --help
...
> cloud-tool instances attach-storage --help
...
> cloud-tool instances attach-storage disk --help
...
> cloud-tool storage --help
...
> cloud-tool disks --help
...
> cloud-tool disks provision --help
...
> cloud-tool disks provision --size 200gb --name new-disk
Your session has expired please log in again.
> cloud-tool --help
...
> cloud-tool auth --help
...
> cloud-tool auth login
...
> cloud-tool storage provision --size 200gb --name new-disk
...
> cloud-tool instances attach-storage --help
...
> cloud-tool instances attach-storage disk --name new-disk