My understanding is that PA Supreme Court issued an ambiguous ruling that said precincts are NOT compelled to allow curing of ballots. But it did not specifically forbid it either.
I think the Republican-controlled precincts assumed that mail-in ballots would disproportionately favor Biden, so they did not make it easy to cure defective ballots. Even after they saw Dem controlled precincts put up ballot cure procedures, the Republican-controlled precincts did not act.
At the time, maybe it was reasonable to conclude that mail in ballots would break for Biden. But in retrospect, that was a mistake. Remember, a lot of the Republican-controlled precincts are rural areas. Many of the voters are elderly. So even die-hard DJT supporters may find it more convenient to vote by mail, rather than drive long distances in cold weather to the polls.
Since the whole mail in ballot system was very new, it was prone to mishaps, and in retrospect, Republican precincts should have bent over backwards to help voters cure defective ballots.
My understanding is that PA Supreme Court issued an ambiguous ruling that said precincts are NOT compelled to allow curing of ballots. But it did not specifically forbid it either.
IIRC, Philly was one of those places that had a precipitous drop in the rate of rejected ballots over both past years, and even the primaries this year.