> With JetBrains, the issue is that they would have almost certainly considered an LSP as a competitive advantage

As a point of comparison, the value that I get from JetBrains products is about 35% UX niceties[1] and 1500000% code intelligence, which no LSP that I have ever seen even strives to do that. They all appear to be focused on "jump to declaration", "what can I type here", and some of them ferry "linter" results back to the user but that is just using LSP as a conduit not that the LSP itself is doing anything intelligent

That's why I throw up in my mouth when someone claims their vim+lsp is a python powerhouse because, sure, it's better than nothing but even PyCharm open source blows the doors off of any LSP

1: and even that has been under constant attack over the past few years from their gravely misguided product management team, culminating in the "you are committing code wrong" https://news.ycombinator.com/item?id=43710699