Likely because of outcome. If just PA, then no change to electoral outcome in Biden’s favor. However, being that 4 states are being sued - that entails (IIRC) 64 electoral votes, which would effect the electoral outcome; and, depending on how the state legislatures respond, could toss this mess into the lap or the U.S. Congress - where Republican delegations outnumber Democrat 27-22.
Well there is little doubt PA broke the law, its own constitution and the federal constitution.
WI also did not treat all ballots the same, where some Dem counties were breaking the law to “cure” ballots while others followed the law... so clearly ballots were not treated universally the same in that state.
Mi and Ga, may be guilty of the same sorts of infractions, haven’t read the TX AG complaint, but there is ZERO doubt that WI and PA violated the constitution.