Apparently you have forgotten that Manfred tried to make this a major league rule two years ago, and after he failed implemented it in the minors as a trial before he tried again.
It absolutely 100% should not stick around after this year, and I do fear it will, but I think it was necessary for this weird-ass season. Even ignoring for a moment that 60 games is not enough to overcome luck effects in baseball, with teams only playing teams in their geographical lineup...
Hydroxychloriquine failed as a miracle drug, so now we're going to test lasers, tanning beds, sunlight inside the body (somehow?), and bleach injections.
Someone tell him about balancing humours. Bloodletting is safer.