The rule is not “goofy” as claimed and will not be changed even though unenforceable for online play. As some have stated - they learned to play on the flat screen and find 3D to be awkward or challenging. One is not more “ real chess” than the other.
The rules are the same. The experience is the same. Different format is all. I find it quite astonishing that some would think a rule would be deleted because it’s not 100% enforceable. To permit a 2nd board only opens the door for fair play violations in Live games - online or OTB.
That's not what chess.com says.
The OP is addressing live play. Most of us know it’s perfectly OK for Daily play and always has been. People need reading previous posts before jumping in with the obvious.