I feel like having both godot-3 and godot-4 sounds ideal, as new users that might not be aware of what version they are using might go look for it. But not sure what others think.
@Vaillancourt That would be my default working assumption.
As for questions tagged with both - that's also something that I expect will happen. It seems problematic either way. Tags suggest tidy categories, but the situation w/ Godot versioning doesn't break down neatly. It may be a case of balancing ease to users (how can we help direct them to the resources & vice versa) against manageable upkeep.