I think we probably deem that one “acceptably old”.
It’s one of the downsides to having a game which has been in development for 10 years. Some assets undoubtedly look better than others (and all of our modern, within the past 2 years assets completely blow away any old ones).
One of the big team discussions we actually had prior to release was how much longer we plan on redoing/improving old assets. It is a bit of a vicious cycle. It would be very easy to fall into the trap of endlessly redoing old/outdated assets, because as you make new stuff, the older stuff which was kind of acceptable before winds up being not good enough by comparison to the new stuff. And given the time and effort it requires, very often you don’t even catch up. We’re trying to reach some kind of reasonable baseline for everything, I would say that sign is acceptable, but right at the bottom end of what we’d call okay.
That said, there are still quite a few low quality (mostly HL2 stuff) assets in the game we do plan on replacing for the next SP update, but there will come a point where we draw a line, and we’re approaching it. We don’t want to be redoing assets ad infinitum. And we certainly don’t have the time, manpower, or desire, to bring absolutely everything up to our modern 2015 standard. We have new, cool things to be making!