They clearly changed their mind.

That "no longer developed" note is from September 2025.

They made a bunch of non-trivial improvements in 2026: https://simplenote.com/blog/

That is sad but not surprising. I think they always had a bit more trouble with its sync system than they would have wanted.

I loved Simplenote for the longest time but ultimately simple pragmatism switched me to Apple Notes after dalliances with several task management apps.