expert people on remote or junior people wanting experience to go remote later on other job

This is what it’s shaping up to be. Also, junior people understand that there is no real loyalty on the part of the company - they will replace or lay off staff at a moment’s notice. And there is a real salary penalty for staying as studies have recently shown. (Also common sense and anecdotes from most everyone you know). Those junior people willing to be in the office will leave in a year or two for a WFH job elsewhere with a salary bump. If RTO /fulltime in the office companies want to keep them, they will have to compete salary-wise with WFH companies.