How often do you make changes to your fit?
I don't intend to make many changes, but with so many old injuries that impact comfort it's inevitable I'll occasionally make a minor tweak or two.
Generally, it's simply a bit of saddle height change, or the angle of the handlebars. Far more beneficial is gym and stretching exercises that keep me as limber and strong as possible. But next on the list is, seemingly, these minor tweaks. Helps, a little.
Though, that said, it's been an age since the last "proper" professional fit. Have gone more-upright in the riding position, this past 20yrs. Have a wider Brooks B67 saddle. Have swept riser type bars. And I just plod along, almost exclusively on paved urban streets with a few flatter hard-packed trails. So, at least to me, there's no great need for fit alterations.