If you do not understand how the underlying language server is configured, what the input and outputs are, how it operates, you will run into errors you are unequipped to deal with.

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.