for the most part 5* wont make a major difference, maybe a 3rd less time? and of course giving us more stars will make the star grind less, but it still this wont happen.
honestly its nice that they even give us the characters basically for free, yes at 3* g11 they arent always great and have very limited uses, but its better then before marquees when new units you had to get from scratch. little to no shards given away, and IIRC they were only in the packs at first before being farmable.
i know MSF is a different game but over there they don't just give you easy characters sometimes like swgoh you can miss whole unlocks depending on their "events" and you don't get to farm them for months or years. here you get the unit and know you can farm in 6 months, and then in 12 months they will have double drops.