So far, these numbers are mirroring 2022 with a small D edge (margin wise)
Requested ballots in 2022 (final) were D+47.5; it's D+51.5 right now.
Returned ballots in 2022 (final) were D+47.9; it's D+50.2 right now.
Final return rate in 2022 was 83.2% for both parties
2022 had 1.44M requested and 1.18M returned.
Looks like PA GOP's new push to get Republicans to use VBM is falling on deaf ears.
I think the issue might be that if you set aside the die-hards that listen to conservative propaganda, a lot of Trump voters simply don't like Republicans. They don't like the GOP, don't trust them, probably don't even see them as an especially good alternative to the Democrats, and a lot of them may not even think Trump is all that great either but they've bought into the lie that he'll protect their job or put a stop to illegal immigration or whatever.
I don't believe that Trump voters are too dumb to know that there are elections other than presidential ones, I think many of them just don't care and don't want to go out of their way to vote for Republicans.