Home Assistant devs have been actively working to get SmartThings up and running again in HA. The principal HA dev on the project has requested some help collecting data to make sure the refactored integration still supports everything the previous one (which used the PATs) did. If interested in helping see here: Samsung purposefully broke SmartThings integration on Dec 30 · Issue #133623 · home-assistant/core · GitHub
It does require some technical knowledge/skills and they list a few prerequisites that might preclude some users from being able to participate, but the dev has been quite responsive and helpful. FWIW: I’m fairly certain that they’ll get things resolved, although they’re not yet able to provide a timeframe.