Someone might have already pointed it out but for me, the sentence of RA is not the main issue, the issue is allowing a single person to stamp through an entire legal system and undermine all of the time and money that is invested in it, even if that person is a president. I suspect that the idea originally was to give some safety valve but if it is used more than a few times by a President, it makes a mockery of it…
Bidens pardons have been even more absurd - pardoning people for unspecified crimes before they have even been charged. Including his family.
It's not one that should be needed or acceptable, and had his successor been someone who seemed to respect law and order I'd have agreed with you, but in the present circumstances it'd seem crazy not to.