It's "testing", not unstable. "Unstable" is actually unstable, and seems to be where people are actually testing things. I find the names needlessly misleading,

It's "testing", not unstable. "Unstable" is actually unstable, and seems to be where people are actually testing things. I find the names needlessly misleading, although accurate, because "testing" is being tested to be the next "stable." "Unstable" is where people are figuring out things; they go into "testing" when they're pretty much figured out. I've had an order of magnitude more breakage on regular Ubuntu updates than on Debian testing. That being said, I ditched Ubuntu probably a decade ago and it might go out better now.