I think the percentages work very well for everyone who’s new or not-so-experienced in DND tabletop. Removing the percentages alltogether would alienate a big chunk of players. Instead, maybe give the option to toggle them off for people like you who’d prefer not to see them.
I don't understand your logic in saying using d20 target DC's in combat would alienate players when the dialogue UI uses d20 rolls to determine success.
