If things hurt on your rides - other than typical sore muscles if you overdo it a bit - then fix it, by all means.
If you are curious, by all means = Do It.
If you need 10% more speed to keep up with a group = Do it.
But,
If one does not hurt
Keeps up with the group (even if 1),
And is not particularly curious =
Why do it?
2 perspectives. YMMV.
edit: My last fit was 2003, buying a custom. Before that 1999, buying a custom (test ride for comfort fitting with expert adjustments). Before that, 1996 - had to fill out measurements, and usage/preferences for a one-off CoMotion tandem.
żDid we have formal fit systems in the mid-90's and before?
I remember the city fit, road/sport fit, the touring fit (and frames), then a Time Trial/ Triathlon fit. Probably some variations = Road had LeMond fit (slack STA and subsequently longer top tubes), and a Pro race fit for wannabe race riders when UCI ruled Race bikes must be Production frames.
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Vintage, modern, e-road. It is a big cycling universe.
Last edited by Wildwood; 03-11-22 at 09:40 PM.