I am sure Dominion is part of it. Election fraud needs to be attacked on all front.
The massively skewed voter dumps by machines (more than the machines can process in the time period) are definitely still a concern and likely crooked.
However, the ballot harvesting, single vote ballots, dead people voting, out of state voters, invalids in nursing homes voting, more voters than people registered, etc... the list goes on an on. So, signatures kinda do need to be checked.