I love Swift too, but dislike Xcode enough to where I wouldn't use it unless I was doing iOS. Even in a medium sized project basic functionality like syntax highlighting or clicking into functions is unreliable. You get used to it being an iOS dev, but switching into something like Intellij is a sobering wake up call where that stuff just works.

Indeed you are right. XCode absolute induces some stockholm syndrome as an iOS dev. Maybe anecdotal, but I do find swiftPM based projects to have far fewer issues than cocoapod + Cocoa based apps.

I'd love to see sourcekit-lsp (the swift lsp) to further develop. Though last time I checked it wasn't exactly usable day to day.

You can use emacs + lsp along with the Xcode lsp server. works great and is way more stable the XCode. I just use XCode for storyboard editing.

(add-to-list 'exec-path "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin")

(use-package lsp-sourcekit :ensure t :after lsp-mode :config (setq lsp-sourcekit-executable "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/sourcekit-lsp"))

(use-package swift-mode :hook (swift-mode . (lambda () (lsp))))

Try AppCode from intelli-j, it's also cross platform