It's hard to square the notion of a MASSIVE fraud with what happened in Congress and Senate. I mean, if there was fraud, they didn't do it very well, did they. Not massive in any sense that I understand the word. 
But also, since Trump was President for 4 years and has been whining about this voter fraud thing for as long as I can remember, shouldn't he have done something about it before the election? It's like those histograms on mirrorless bodies, it sure is a lot handier seeing the histogram before taking the picture.
Cause you know guys, there's not much that's easier to do than count votes. It's not high-tech, no mystery involved, just volunteers putting numbers in columns then double-checking the sums. Many countries have mastered this, a lot of them with fewer resources and experience than what the USA can bring to the table. So what gives?
You know, don't you, that there are people all over the world shaking their heads at this sh*t show. Or is it all just really part of an anti-immigration meme, hoping that people all over the world are looking at this and thinking, "Nah, I don't want to move there."
Just lke the pandemic response, voting is a State matter. Its not Federally controlled and as such each State has its own rules. The President can't order a State to change is voting methods any more than he can make them enact a mask mandate. For good or for bad thats the system.
Counting votes is more involved that just making a tally and much of it is done via machine with a computer interface. Humans are also a big part of hte mail in ballot counting and more important the ballot verification process.
