A while back I posted the number of games each of these guys has missed. As of now, the Sox have played 145 games. Betts has played in 143, starting 141. Bogaerts has played in and started 139 (IIRC, he has gotten 1 game off each month of the season). Devers has played in 141, starting 137. At least a couple of his misses and games not started were when he had that hamstring issue.
Let's not pretend these guys are getting a game off a week. And anyone who thinks travel days are days off is an idiot.
The year's over as far as making the postseason. No need to begrudge any player a day off now, especially those three.