My understanding of the Wisconsin situation is that there were concerns about the lawfullness of those park drop offs, but that lawmakers are hesitant to toss ballots out when voters were following the rules told to them by election officials. And, at the end of the day, the case was thrown out... so ¯\_(ツ)_/¯ .
Trump's legal team also submarined their cause by focusing on the two counties he lost, despite the fact that the issues they claimed were fraud would've happened all over the state. So why not look into the other counties? Further, the same issues Trump's team were trying to argue were fraudulent in 2020 were ALSO in place and being exercised when he won in 2016. So, it wasn't a problem then, but it is now because he lost?
Ultimately, there has not been near the evidence or facts presented by Trump's team to prove fraud at the levels that would've over-turned the election. Could some practices be improved? Absolutely. But we're making mountains of molehills.