I'm sure if you google "neovim F# LSP" you'll get about a thousand hits. ...MS gave LSP to the editor world so most of us can get by without IDEs now-a-days.
There is much more than LSP however. There are things like graphical package management, unit tests runners, launching the application with a debugger attached, managing multiples launch configurations, integrated source control etc...). With F#, file order matters, so it's cool to be able to drag and drop a file, and have the build file updated automatically. Lots of large and small features, all seamlessly integrated with each other and working out-of-the-box on day one without needing to spend X months to learn lisp & Cie.
I am not trying to trash lightweight code editors by the way, I understand and respect that many people feel more productive with them. I am just highlighting that commercial IDEs bring serious value to the table, and most people, me included, are way more productive with them. The difference was day and night in my case, to the point that I had to change my desktop OS, despite having a lot of good will to make things work on FreeBSD. The situation may be different depending on the ecosystem your are programming for.
But for .NET and F#, and I think generally speaking, for commercial IDEs allow you to opt into what you want to tweak in an advanced manner, while the rest just works out of the box. There are only so many things we have time to learn and master, and these tools allow one to focus on the work they are interested in immediately, instead of having to deal with a distracting and sometimes long learning curve first.
There is also the fact that when you run a business, you need to ensure that onboarding will be easy and that people can focus on their work.
