Thank you for moving this back to the Features Requests. I have the same problem as @Ninsuhn and there are other topics on the forum talking about this as well. I have the same behavior as @rigmarole like double-spaces, but no autocorrect at all. I tried to run with and without plugins and CSS snippets, as you suggested, @rigmarole.
This is my Debug Info (if others want to post that as @rigmarole suggest, please use on macOS the hotkey Cmd + P and type Debug):
SYSTEM INFO:
Obsidian version: v1.4.16
Installer version: v1.4.16
Operating system: Darwin Kernel Version 23.1.0: Mon Oct 9 21:27:24 PDT 2023; root:xnu-10002.41.9~6/RELEASE_ARM64_T6000 23.1.0
Login status: not logged in
Insider build toggle: off
Live preview: on
Legacy editor: off
Base theme: adapt to system
Community theme: Things v2.1.19
Snippets enabled: 1
Restricted mode: on
RECOMMENDATIONS:
Custom theme and snippets: for cosmetic issues, please first try updating your theme and disabling your snippets. If still not fixed, please try to make the issue happen in the Sandbox Vault or disable community theme and snippets.
I really would love to see Obsidian support native macOS autocorrect!