-PJ
Because there is already a slate of electors chosen, by the voters, according to law. The legislature would be acting contrary to the law by appointing a second slate. It's one thing if a court says that's the option they should follow. It's another thing for them to do it just because the decided to. No court is going to allow that. It opens up a scenario where any legislature in any state could override the election just because they don't like the results.