I've flown with plenty of 200 hour-ish FOs and they were great. They knew their stuff, were enthusiastic, keen to learn and hand flew very well.
That is very true! It is a lovely warm, short sleeve shirt environment. The thing often lacking is the fear factor. That moment in your experienced past when you frightened yourself just enough to realize you shouldn't do it again.
200 hours and stuff and enthusiasm, isn't really enough time or experience to have incorporated this ingredient into the mix. They may not have frightened themselves yet,
but one day they will! That first time shouldn't be with 250 passengers in the back and another 200 hour-ish cadet in the right seat, who knows his stuff and is enthusiastic, and keen to learn and flies very well!