I can work with either as a player easily enough, and have done. Harder as a GM to have tabula-rasa players—but!
See: @adinfinitumadv.bsky.social's "The RetConQuest." Starts with the timeline having been altered and the players don’t know who they’re supposed to be. Characters are rolled up during.
Ad Infinitum Adventures presents another adventure for ICONS Super-Powered Roleplaying, by game author Steve Kenson, featuring the terrible Tempus Khan from the Villainomicon.
Decades ago, Tempus Khan...
#TTRPG Folk - are Backgrounds essential for character creation?
Would you just embrace it if you had a character without one and just built their story on the way?