And these people probably still have AOL and dial up internet. They are not technically savvy and trying to enter results in a smartphone app is like trying to launch the space shuttle. It's not like professional business people are running most caucus sites.
With that said, a caucus does serve a valuable purpose. It really isn't to pick the winners, it is to weed out the for sure losers, no matter the party.
They just need to do what the rest of us geezers do—find a young person to help us!