With the way you suggested, there's no point besides fashion (which sounds kinda cool actually, synthoceps as a fashion accessory would be pretty cool)
If you were allowed to keep the perks from each exotic, I could definitely see that breaking both, PvE and PvP. Take combining celestial nighthawk, stareaters and still hunt for example, thats probably close to 3 million damage in 5 seconds lmao
English
-
There are four armor slots 4 exotics to equip only one perk can be active. you can switch any of the perks but only one can be active.