Just a thought, but maybe some of riders need a different geometry + jones bars + 27.5+ tires? maybe even suspension.
truth be told I can't run a jack hammer like I did when I was in my 20's, I also can't run an earth compactor like I did in my 20's. but I have been out of that industry for 30 years, I am not near as strong as I was then.
Maybe the quest for "bicycle comfort" starts with core and strength training? tighten up and condense the mass.