I'll continue using it until the core features like instant prompt and transient prompt start to break or I run into bugs that I can't live with
No. The author simply sees it as basically complete and decided to spend the time he has fixing bugs instead of taking care of issues.
> MOST BUGS WILL GO UNFIXED
It's just a shell prompt. There really won't be much in the way of bugs. And it's popular. Doing a quick scan of github issues, there's no shortage of questions where some other random plugin or weird terminal emulator has strange interactions. I think the author can be forgiven for not wanting to diagnose such combinations.
As a former maintainer of LiquidPrompt I can only agree.