Yes, I know. I also don't know any engineer who bothered doing it (yes, I'm sure some do in critical circuits).

Capacitors also vary, and degrade over time. Semiconductors also have variances and non-linear hard-to-model behaviors. Behaviors change with heat. Few people worry about it.

Vacuum tubes are known for their wacky behaviors, which are treasured by people who make guitar amplifiers. The Melotron is well known for being highly sensitive to humidity.