Yep, much worse. It will take weeks to count all the votes. Massive number of ballots will be lost. Litigation will follow.
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Since the certification signature by the voter is on the OUTSIDE of the return envelope, it will be easy for anyone/anyplace in the returning mail process to SELECTIVELY remove undesirable TARGETED ballots. Since Pennsylvania is a state where the ballots must be RECEIVED by Election Day, the corrupt postal employee(s) can simply just temporarily hide those targeted ballots until after Election Day and then renter them into the delivery process... its not necessary to criminally destroy or throw away the envelopes. Its just an OOPS!
They can selectively “lose” ballots just based on the area where they were mailed. Everybody knows which counties in PA are solid red.
Trump should try to stop this via executive order on national security grounds. Under Obama the election systems were designated as critical national infrastructure. This gives Trump the opening to regulate it.