It’s not about penalizing him; it’s about having some perspective. The OP threw this out there as if the game has been the same since 1876. Sure, he didn’t explicitly state Gehrig played 162 games per year, but it was also the only length of a season he acknowledged.
And this is not to single out the OP; it’s a common myth among baseball fans, who say things like “today’s pitchers are soft. I remember back when Ol’ Sandy “Rapid Ryan” Gibson would throw 400 innings as a starter, another 200 as a reliever, play outfield when he didn’t pitch, and in his spare time he’d get drunk and beat up a milk horse. Back then, men were men.” And then pretend nothing changed except players getting softer. They’d ignore big factors like the schedule getting longer, the postseason expanding, the game getting faster, increases in specialized roles, escalating salaries that turn players into assets, increased international participation that expanded the talent pool, breaking the color barrier, etc…