There shouldn't be any reason that it reruns save upon entering/exiting insert mode; are you sure you don't have some kind of keybinding/other setting that's autosaving for you?
The `<tab>` issue is kind of a pesky race condition that's most likely exacerbated by VSCodeVim running slowly on your computer.
Speaking of it running slowly, I would argue against characterizing them as "slow". Some small subset of users seems to have consistently run into this issue, and a decently large subset of those users have realized that the issue is caused by some conflicting plugin, so I'd suggest trying that too.
As for the undo issue, I have mixed feelings about it. Perhaps it could be synced with VSCode, but it's definitely true that when it was first implemented, VSCode did not provide the flexibility to do so.
Overall, I do agree that there's stuff that can improved, but it kinda hurts to see people call them "atrocious". I suspect your main issue with VSCodeVim is really the "slowness" issue. I would try disabling other plugins and see whether it helps.
EDIT: Forgot to mention. Disclaimer: I'm one of the primary maintainers for VSCodeVim.
Sorry :( I hate to be harsh and I don't want this to get you down, because I have a lot of admiration for the work you do (and this goes to any open source work I've ever criticized, really). So, thank you for your work.
But... the usability is really bad. They would be completely fine in a vacuum if vim didn't exist, but the point of comparison exists and it's vim and vim is just crazy fast compared to vscode-vim, it's like comparing a racer... to a fighter jet.
> What's the bug that you have with `2d}`?
That only deletes one paragraph (like 1d}) instead of two. 3d} only deletes two, and so on. It's not consistent with vim.
> There shouldn't be any reason that it reruns save upon entering/exiting insert mode
shrug, I filed an issue about this a couple weeks ago after a decent bit of debugging.
> I suspect your main issue with VSCodeVim is really the "slowness" issue
ish, it's definitely the primary pain point but there's also lots of small bugs and inconsistencies with vim. And I understand that competing with vim itself is hard, but the other comparison point is for example pycharm's vim plugin and vscode's is far behind.
Edit: And just to echo tdfx's point, without your bindings I wouldn't even be on vscode, so there's that :)
I've reported all these bugs with not much in terms of answers. I've even tried contributing but it's a pretty messy codebase to get into. Ergh.