>>1665514couple more condition things
People looking at used bikes should read this post and above.
slop in the derailers. If you grab a derailer and jiggle it, and there's a lot of play in the pivots, they're very worn and won't work that well. They'll work but that devalues even nice parts. They're at the end of their life.
Brake hood wear. If road bike brake hoods are very worn, like the rubber is very smooth, that means the bike has been ridden a lot. Conversely you can tell a practically unridden original condition bike by the condition of the hoods.
