I honestly enjoy the work when I know what's going on. We have a lot of unique problems to solve, and I have gotten positive changes made, as well as some really good weeks where I pounded out some good code, but other times it's slow, sad, and frustrating.
Like others have suggested, use git locally, there's no need for them to be involved or aware of that detail. Do you consult them on what text editor to use?
There's a skill to learn in keeping engineering concerns to yourself. It's unsurprising when management or executives are faced with decisions in unfamiliar topics they err on the side of Nay. Your mistake is involving them at all.
Using git locally is a tool just like your code editor. There's no need to ask your boss about that.
Since you're the only developer it's mainly to make it easy to revert any mistakes and to have confidence in deleting useless stuff (that you can recover later).
You can have a git repo on a server that developers use ssh to access just with git. The bells and whistles aren't part of the core job. It's just my general griping about software these days.
I get where you're coming from, but I still don't think it deserves a ??. Most people in most environments want a GUI they can click around in.
I'm very comfortable with git at the command line, but I still think it's valuable to have a web interface. For instance, with a web GUI I'm able to share a link to a specific line or range in a file in a specific commit.
Typically if I need to do that I'm asking a question or requesting a change, and in that case I want there to be as few barriers as possible to increase the chances that the other person cooperates. Asking someone to clone/pull the repo, checkout a hash, and then view a line in a file is a much higher barrier than asking them to click a link.
Linux is one of the most massively distributed projects in the world, and it just works fine without GUI review tools. If Linux devs don't need such tools like gitlab, why you?
I honestly enjoy the work when I know what's going on. We have a lot of unique problems to solve, and I have gotten positive changes made, as well as some really good weeks where I pounded out some good code, but other times it's slow, sad, and frustrating.