I mean it does support LSP, natively, I found that ultimately that's all the plugins I really need. It working out of the box and not requiring megabytes of configuration files is one of its great strengths.

If all you need is some customisation it's perfectly possible to write custom commands that execute sequences of commands. Including calling out to the shell and piping to and from external programs. Strictly static sequences though unlike the abomination that is vimscript they're not making keybindings a scripting language...