BillyG said
 But, to get back to the violin's experience - never had an issue in over 5 years with string pegs slipping or even radical tuning changes OTHER than when sudden and dramatic changes occur in either or both temperature and humidity.  I've generally found that yes, if tuning drift occurs - it is pretty much equal across the instument - so it may (overall) end up a tad flat or sharp overall (not important unless playing along to a backing track - but even then - as the great Ivan Galamian wrote - 

One should be able to play in tune on a violin which is out of tune. The performer who has acquired such a skill will never be shaken out of his assurance and authority in public performance by a recalcitrant string.

LOLOL- indeed !!!   Words to be appreciated....  I believe we have both said this before "Let your ear be the guide" ( or words to that effect )

  

Adjusting to tuning drift can be surprisingly automatic and subconscious -- especially if you don't play an open string for a while. I remember one concert in 2017 or 2018 where my G string gradually drifted flat. I kept on playing in tune, and I didn't notice I was adjusting because I never had to use the open string... until the last few bars of the last piece when playing a big, ringing chord that included the open G string. It was at least a quarter-tone flat by that time.