If you don't have a resume, do you still ask about candidates experience?
Many people can talk a good game and come across well but still be useless (e.g. hard fail on the simplest of white board tests).
I haven't done interviewing (on company's side of table) for a long time, but my main tack was always to go over projects on resume, focusing on last 5 years, and drill down to see if they could fluently talk about them, draw architecture diagrams, justify choices, etc, etc.
I you don't ask about past experience (= same as having resume), then how do you even know what the person's experience consists of? Useless cog, or tech lead? Highly agentic or passive, etc?