I disagree about tanning while in the sun. I like that it is optional because I never want to see a tan on my perfect sims. I would be mad if they forced it on my sims. Many live in sulani so they would all be automatically tanned.
Based on this pic it seems a bit strong. But I don't know if toning it down is the best option. Then tanning gets nerfed and people complain sims can't get tan enough. Would be nice if they could add stages yes. But that's just adding more complexity people will soon complain is broken. ?♀️