There was once a time when politicians would use election time to debate the president anyway, allowing up and coming politicians to get their views and voice out there while also letting the current president show their strength, conviction, and skill even within their own party. Time that's used for inter-Party debates is time where that party's points are being broadcast to all, as well.
But now that we're all so scared Trump's gonna win were tossing that in the garbage because "any question to Biden at all means we get a fascist!", which is only gonna bite the US in the ass when Dems eventually have nobody that's well known ready to take the seat
Biden absolutely should have been challenged in the primaries by competent Dems that will be the next generation