Does this only apply to piano, brass, and woodwind? Seems like with choral or string music, high level performers would naturally adjust the tuning of their par

Does this only apply to piano, brass, and woodwind? Seems like with choral or string music, high level performers would naturally adjust the tuning of their particular note to match the context of the chord. Like I can't imagine someone singing a 5th and NOT falling into a perfect tuning.