.
You see, there are players who equip their pokemon with TMs for PvE and PvP. I guess it is common knowledge that Feint is a duel TM, hence those players who enjoy PvP would have pokemon with Feint. Another example would be Golurk. Golurk, because of its ability, is quite popular for both: PvP and PvE, however my Golurk is more Duel-based, meaning it has Shadow Storm and
Rock Polish, whereas a player who equips his Golurk for PvE would have either Shadow Storm/Epicenter or Shadow Storm/Tectonic Dance or whatever other PvE TM combination. Obviously during Raids, there is a higher probability that the Golurk with SS/Epi would deal more damage than my Golurk SS/Rock Polish.
Moving on... I am going to talk
from my experience now: For some Raid Pokemon, most of the time having Rain Dance/Hydropump/Bullet Seed formula TMs is better than having Feint. For Example:
Mew, Mewtwo, Volcanion, Mega Steelix, (Shiny) Celebi, Palkia, Latios, Latias (Probably many more, but I don't have them in dex). These Bosses have weaknesses, which means using Rain Dance/Hydropump/Bullet Seed formula moves would give you a HIGHER chance of getting most damage than Feint.
We also have other Raid pokemon, which have a resistance to normal-type moves, but receive normal damage from other types:
Mega Lucario: usually defeated using Fairy-type moves
Mega Manectric: usually defeated using Ice-type moves
etc...
And finally we have another list of Raid pokemon which are strong to everything. For this last list of Raid pokemon using Feint
could give you indeed a little bit of advantage.
However, this depends
MAINLY on the player. Going to raids is not only staying in the SAME spot using revives and Feint. I have seen several times how some players revive their pokemon and when they release it again, they immediately use Hydropump-formula move and they don't even hit the boss, because they have no idea where the boss is.
Winning a raid is so much more than that... you need to follow the pokemon, move around, try to be close to it in order to hit with hydropump/terrain moves, etc...
Please Karl, don't get me wrong, I am not insinuating that you should "learn how to do raids" or something like that. NOT AT ALL. But there are indeed players who are more skilled than others, and I don't believe Feint gives you a huge advantage.
Reflect/Counter was something else, because during those couple of seconds you could deal 50k+ damage to the boss, that was indeed ludicrous!
Also, I believe if Staff accepts to remove Feint, then there would be players like this one... who later would be like: "There should be other things restricted during raids, like... Bullet Seed formula moves are too OP, block them... "
My humble opinion