Biden issuing a reversible EO is not a guaranteed fix, though,

[Hortensis]

straight off to the courts and if the EO patch survives cancellable by the next president.

Controlling the nation's purse is congress's job, and the OP asks why senate Democrats didn't do it. Congress could eliminate the debt limit or at least push it way up so it wasn't triggered every year, or adopt other floated fixes, but that'd of course require majority Democratic support in both houses. We need bigger majorities so the few more conservative leaners in our liberal caucuses have less influence.

Good article, though, well worth posting and reading.