It's not IDEs in 2022 that use LSP, it's editors. As a grey-beard, M x N wasn't "small".
From memory, notepad, notepad++, scite, vim, emacs, netbeans, eclipse, VS studio, IDEA, sublime text, bbedit, plus a number of linux only ones. Languages, VB, C++, Pascal/Delphi, Fortran, Java, C# (from 1998/9?).
The problem was tight coupling of languages to IDEs, in particular VB, and C++ to VS, and Java to Eclipse.
From memory, notepad, notepad++, scite, vim, emacs, netbeans, eclipse, VS studio, IDEA, sublime text, bbedit, plus a number of linux only ones. Languages, VB, C++, Pascal/Delphi, Fortran, Java, C# (from 1998/9?).
The problem was tight coupling of languages to IDEs, in particular VB, and C++ to VS, and Java to Eclipse.