Wow, you are really confused. The argument about the functionality being already implemented by Firefox was about https everywhere. This has nothing to do with adblocking and it does break some sites (the one still not using https) but you can still access them with a click.

Cookie autodelete is useless if you use Firefox on strict mode.

I don’t understand your edit, how is more things doing the same thing better? It adds complexity, attack surface while taking resources.

Decentralise and adblockplus do nothing uBlock Origin doesn’t already do. You can remove them. Also it’s uBlock Origin, not just uBlock.

Bash LSP server can use shellcheck and shfmt but you have to install those manually.