I agree,
But rolling 3 extra 5* dupes from gacha is a low probability. I wouldn't argue the fact that rolling a 5* would be stronger in the long run. I am arguing that using gacha to get 5*'s was a waste of FGems (which i now understand is not). However, being that as it may, 5* event's will continue to be stronger than a 5* gacha whom have only 1-2 slots. Yes, you could take the equipment that you get from the event and put it on a 5* gacha girl, but unless they have 2+ equipment slots open, those equipments would be better spent on the Event girls. Yes the gacha pool has girls with better Abilities, but it also has ones with just as bad or even worse abilities as some Event girls. Without Dupes 5* gacha girls will never beat Event 5*s.
TL:DR : I agree, if Gacha 5* has 2+ equipment slots.
*UPDATE*
So decided to roll gacha, because yea Gacha isnt a waste of Flower gems.
Gacha is garbage.