Well then simply put you didn't look too deep into it or otherwise you'd probably have encountered one of the tons of glitches with their UI, entity pathing issues, regime conflicts/issues, zoning issues, deployment issues, tons of job issues, bugs with the needs system, items disappearing for no apparent reason and the tons of other weird glitches that existed long before and long after they left early-access/alpha (which at least was an excuse for a lot of those things happening).
Also the performance issues even without additional map expansions have been reported countless times on their forums, bugtrackers and elsewhere. So I wouldn't say it is just a problem of owning a toaster as PC.
I know they are/were a small team and I also can understand fatigue after many years of work on the same project when you already want to do something else but it doesn't excuse the mentality of producing tons of content with minimal quality control. If you do that you have to be aware that at the end of the road there will be a bazillion bugs and other quality problems to fix.
Just tossing that part off to another company... is strictly said... irresponsible.
Also they could have called an end to the feature creep anytime and concentrate on fixing what's there like many people have told them over the course of development. They put that burden of more and more content until quality control eventually outgrew their means on themselves all by themselves. Now they have to live with the consequences that some people, like me, are kinda disappointed of the way they treated this. Not like they would care much now that they tossed the burden off to someone else anyway.
If you can't pull the weight then just don't put such a load on your shoulders in the first place.