You have a pre-installed tool and a tool that looks better but which you need to install. When you need it for a rare task, and you administer many machines, it is easier to use what you already have on each of them.
Sorry, I don't understand what you are talking about. Yes, you can run them in SSH session. No, you still need to have them installed on the remote machine to do this. And installing diagnostic tools is not only time consuming, sometimes it can be even impossible if you already get in troubles (and if you did not, why would you need them?).
Cringe take. I'ts just a fun pretty system monitor tool. I work as a senior cloud architect. I have 10 years of pretty heavy professional and home Linux usage and I just installed it on my home server because I have a unused 1/3 on one of my monitors at home where it can just live forever inside tmux.
It's fun to see Plex take more resources because someone started a stream, or see the different parts of kubernetes working when I start a few containers. I have also added a drive to my btrfs raid so I was interested in seeing what kinda load the re balance did on the system over time. Turns out not much. It's a fun tool.
I use different tools on the several Azure environments I am part of maintaining lol.