Skeleton.css is my current favorite bare bones framework. Its last update on github was 3 years ago though, so I'm checking around to see if there's any similar bare bones framework. I know an update to skeleton.css might not be necessary because everything works, but Shoelace looks promising.
This assumption/worldview is interesting. I recognize myself thinking this way too, but on the face of it, it's a bit weird: if a project does not see continuous updates then we consider it to be outdated and worthless.
This definitely applies more to some things than others, but I think it's worth questioning, too. Does the thing still work? Was it great 3 years ago? Is there a reason it's less great now (other than that it was created 3 years ago)?
FWIW I based my blog theme on Skeleton. I must admit that the 3 year age gave me pause (irrationally, probably) and that it's worked out nicely.