neovim-ui

I understand the frustration (making neovim more cohesive is definitely a goal). It sounds like coc provides the UI you are used to, so there's no harm in sticking with that! Many of our users explicitly don't want automatically called functions that would slow down the editor (autocommands that map signature requests to the language server, for example), so by nature neovim's core implementation is extremely conservative. One thing I would like to do, is make the automatic pop-ups for signature easier to implement with our current handler, which means a plugin like signature-x could use our upcoming lsp.config option to configure it's borders (https://github.com/neovim/neovim/pull/14681), and match the rest of the UI. I also have another project I was working on before the 0.5 stabilization phase (https://github.com/mjlbach/neovim-ui). T

Yup! We want to create interfaces to make this simpler for people to use. One example is here: https://github.com/mjlbach/neovim-ui which is just in a separate repo to make it easier to work on rather than one huge PR. This is an extension of the ideas that I started in https://github.com/nvim-lua/popup.nvim and a few other places. The idea would to be to create interfaces that users, plugins and/or GUIs could override to provide a unified experience while still being customizable for users. (and as a self plug, I think we have a lot of interesting ideas in telescope.nvim about UI that could be upstreamed over time)