I don't think there's anything inherently wrong with the idea of using a GUI, especially for a non-professional who mostly just wants to get into self-hosting. Not everyone has to learn all the ins and outs of every piece of software they run. My sister is one of the least technical people in the world, and she has her own Jellyfin server. It's not a bad thing that this stuff has become more accessible, and we should encourage that accessibility.

If, however, you intend to use these tools in a professional environment, then you definitely need to understand what's happening under the hood and at least be comfortable working in the command line when necessary. I work with Docker professionally, and Dockge is my go to interface, but I can happily maintain any of my systems with nothing but an SSH connection when required. What I love about Dockge is that it makes this parallel approach possible. The reason I moved my organization away from Portainer is precisely because a lot of more advanced command line interactions would outright break the Portainer setup if attempted, whereas Dockge had no such problems.