My band rarely tunes up. I think the main difference with brass is that you tend not to move slides whereas a lot of orchestral instruments are dismantled which affects tuning..
Players also play with different bands / orchestras / ensembles so instruments need to be tuned for the particular scenario.
My experience is that tuning up happens after the band has warmed up if the MD notices tuning problems that haven't already been corrected by individual players. Experienced players that play with multiple bands, usually know broadly whether they need to change their slides for any particular band.
(I played a few painful and frustrating rehearsals under one MD who would often tune the band about 3/4 of the way through the rehearsal. This was a scratch band made up from players from several other bands so being tuned early should have been recognised as an essential early activity.)