LSP is one of those things, or at least it has been, for a while.
LSP is also something that's not necessary to writing quality code; it's absolutely a major quality-of-life boost, but before rewriting my configs after switching to Rust, my LSP usage was limited to being a slightly faster autocomplete engine more than anything. I didn't have keybinds set up for going to definitions, implementations, or references of symbols. I still put out what I think was decent code. I'm also better off now that I've adopted a more useful config.
IMO it's an important part of this industry (among others) to let developers have whatever workflow they want, within reason. If someone decides they want to invest the time into setting up LSP with their editor, that's their prerogative. If not, that's fine too. I don't know who among my present or past coworkers use LSP outside of occasionally chatting about editor configs with one or two of them, because they've usually figured out a workflow that lets them produce respectable code, and I've never had to question their tooling before questioning their methodology.
If your tool is TextMate, you should learn how TextMate grammars work. If your tool is vi, you should learn how modal editing works. If your tool is Ed, you don't need to learn anything because "Ed is the standard text editor".[1]
A programmer having to learn how language servers work isn't a pain point, it's their job. It takes a couple hours to learn. A couple hours to learn how to do part of your job isn't notable. Complaining about learning how to do one's job makes one unqualified.
I got into programming long before LSPs and MCPs.
The only craftsmen are the ones at the edge of the lingo tree?
To use your own analogy, as a machinist myself : I can master the concept of the lathe and bow drill without learning simulation-driven CAM, and I would be no less a machinist than the guy pressing buttons on a brand new Haas.
If you work via notepad.exe and assembly with a compiler and linker ready in the next window, fine! the work is what matters.
If you don't use language servers, you don't engage with development environments which rely on them, you need not learn them.
If you're making chips on a Monarch 60 you don't need to learn shit about CNC. If you're pushing buttons on a Haas you do.
If you're coming from a Monarch and want to try pushing buttons on the Haas on the kids are using, you need to learn how CNC works. That's your job. If you want to switch from notepad to Zed, you need to learn how language servers work.
Can you not use Zed without knowing how language servers work?
Some languages are more severe than others on this. For example, in C++ your editor is not going to be able to make efficient use of the clangd language server without intervention from the programmer to understand and configure it. On the other hand, for Python the Pyright LS will be mostly fine without additional configuration.
I only had to silence a couple of unneeded warnings specific to codebase I was working with, which took under five minutes and that only because I finally got annoyed enough. Otherwise it took zero configuration (this was Kate though, but it doesn't matter, there is no clangd-specific default config there).
I want to be a craftsman and know my tools and want to actually enjoy using them, but it's becoming less accepted to do so.