"Why I'm no longer using vim and now using X" typically result from not digging into Vim enough. All the issues the OP is having have been resolved from either updates to vim, switching terminals, or just understanding vim basics.
NOTE: Plugs can be slow and the OP is correct that some are hacky, but typically there's the Vanilla Vim solution to a problem that takes a little bit of reading and/or finding to solve.
If plugin/loading speed is really an issue then switch to using Alacritty and Neovim, use vim-plug for async & lazy loading plugins. You get truecolor support and you're using your GPU to render everything. If plugin speed is still a problem, learn why they're loading slowly, then dig into why rather than just saying "they're hacky or clunky". Silver search is great, but if you understand how to execute terminal commands from vim (:!) then you can grep everything and remove the need for silver search. I use FZF (https://github.com/junegunn/fzf) which is another fuzzy searcher that's optimized for speed, built with Go.
For those that don't want to put in the time to optimize and learn vim, then by all means switch editors. But don't blame the editor ("I will not use shitty software just because it’s open source.") unless it's truly the root of the problems, explore and find better ways. A key thing to remember as a Vim user is there's always a faster way and your .vimrc will always be different from another's.
Edit: For those interested in my setup (https://github.com/hhsnopek/dotfiles/blob/master/.nvimrc)