I think if you want to work on systems software you should enjoy working with legacy cruft, otherwise you're just going to be miserable. I mean it's everywhere from the language, to the POSIX APIs, to device drivers, to hardware quirks... C++ is only a quarter of the problem.
Go is easier for onboarding, it's fixed the major issues people have had with it - it has modules, it has generics. It's easy to package a binary versus deal with having a Python venv.
Go is just the best common denominator and that's what the majority of people need. I really feel that people want to use Rust because it's interesting and fun, not because it's really the better tool for the job. The vast majority of applications can use GC and are not resource constrained by Go's runtime or binary size.
I hate to break this to you, but Vim itself is in the process of converting its runtime files into Vim9script (which is Vim specific), and many new Vim plugins are also being written in Vim9script.
Neovim has always supported "traditional" Vimscript, and has ported all runtime file changes from Vim (think filetype plugins, syntax highlighting, etc.). In fact, we explicitly request that any runtime file changes first go through Vim precisely because we want to keep the two projects aligned. But the more that Vim transitions to Vim9script, the less can be shared between the two projects. So unfortunately the "fracturing of the ecosystem" is not specific to Neovim.
From my perspective as a vim user, neovim has only made my life worse by splitting plugin authors into two camps without any real benefit over what we had in vim. The only good thing about neovim is it caused some nice features to be added to vim, which the neovim authors could have just contributed themselves without trying to fight for control of the ecosystem with Bram. Neovim has really just made things worse for everyone.
Still is feels like Neovim is more stable and faster than the regular Vim somehow. Plus it has much better defaults.
- Using too many plugins without understanding all that vim has to offer.
- Cargo culting configs instead of building up little by little.
- Trying too hard to rice vim in appearance without adding meaningful utility.
The same applies for Emacs. Vim and emacs are powerful editors not controlled by corporations, have succeeded for decades when other editors have floundered, can run in any basic computing environment/terminal, and are logically present in many Unix tools. Like all of software engineering, a deeper understanding of the system you're using pays huge dividends in the long run.
In short, take the time to learn one of these editors in it's basic form and then nurture a small config that can go a long way, and you will find success.