I don't think so.
( ・ั﹏・ั)
"Luck EX" as in: resetting your turn by turning off your phone in order to create a better outcome?
No.
If you mean the servant stats. Like The SLuck, Np, Agility, mana, those, Im pretty sure they don't effect gameplay but idk.
Those stats actually do have a use, but not in that way. They affect base stats, but the problem is they don't affect the stats of all servants, with newer servants being far less likely to be affected by them. Here's an explanation.
What do you think?