Can you give an example of what you would characterize as "smears against people who call for entirely reasonable verification"? And while you're at it, who you consider a "top-tier expert"?
It seems to me that the people getting served with lawsuits weren't just concerned about vulnerabilities and calling for verification, they were outright claiming that the election was stolen. And stating made-up ideas about how it was done as facts, at that. Like Sidney Powell saying Dominion machines were designed to count Biden votes as 1.26 and Trump votes as 0.74.
If all they wanted was verification, well, Georgia recounted all the paper ballots by hand and compared the results to what the machines scanned. So did Antrim county in Michigan. So did Dane and Milwaukee counties in Wisconsin -- which Trump's campaign paid $3M to recount. Those recounts didn't show a problem with the machines.
If you believe it was stolen, you have to believe they faked the recounts too, or that they recounted fake paper ballots fabricated to back up the original numbers. But at that point, is it really about the voting machines? You could take the machines out of the picture completely, have an all-paper election, counted by hand starting on Nov 3, and have the exact same allegations that you don't trust the count.