The point is to force their fraud out into the open.
If you give them plenty of time then they can make gradual adjustments
Making the F like the graphic above is like a signal flare that draws way too much attention
Evidence is allowed to be destroyed, like the return envelopes voters signed. if not, than at least the ballots they contained are separated and never able to be associated again. if a signature, postmark or registration is found to be invalid, they have no way to identify the person's ballot so it can be withdrawn. Workers at some facilities were instructed to open the outer envelope, remove the inner envelope, and put them in separate boxes BEFORE any attempt was made at validation. Doing that ensured invalid votes counted.
Without evidence, all the attention in the world isn't going to make a difference. We know many things were questionable in 2020, but without the proverbial smoking gun and guilty parties admitting they broke the rules/laws, it's difficult to catch them in the act.
The whole counting system is so convoluted, even recounts don't matter. Tally operators that "corrected" ballots aren't going to go back and correct all the unreadable ballots again, and if they did, how would we know they made the same change as the first time?
It's such a simple process: 1, 2, 3, 4, 5 ...Trump, Biden, Trump, Biden ....
They've made it so complicated, there's really no way to audit what happened on election night and the few days afterward