The debt limit has to be raised to pay current bills.Dems could have demanded concessions to pay those bills just as The GOP did.The GOP president told Dems to fuck off.The Dem president fucked his voters to the tune of 1.5 trillion in cuts and restarting student loan payments with nothing in return.
Pay current bills = Spending
So Dems would say that they won't vote for more spending unless they get what? More spending?
That's illogical.
But let's even consider your scenario, you are upset that Biden negotiated and Trump didn't.Biden negotiated because Freedom Caucus in the GOP forced McCarthy to cut spending.
Where was the House Progressive Caucus making similar demands under Trump? Where was AOC, Jaipal and the squad?