LR doesn't have what I need compared to LR Classic. I've already migrated my LR catalog into LR and that has fully sync'd with LR Cloud. If I go back to LR Classic, everything works but I see sync has been disabled. I'm not sure what will happen if I re-enable LR Classic sync considering all my photos are already uploaded to the cloud via LR. Any ideas on the right steps to follow to avoid any issues (e.g. ending up with a duplicate of every photo in the cloud).
Go ahead and continue to use Classic and just turn syncing back on. Classic will only sync collections you have chosen and it only shares Smart Previews, not originals. I have Lightroom Classic and Lightroom CC running at the same time on the same machine and it works perfectly.
I don't want my cloud photos syncing to Classic so I have syncing paused.
Additionally - I have pretty much stopped using Classic in favor of using the Bridge/Camera Raw/Photoshop workflow for images I don't want in the cloud system.