I could foresee a problem with adding them to raids, at least with the raid bosses using the moves.
If a raid boss like giratina were to get a stat buff, it would be come much harder to beat, very spam able charge move, same for Rayquaza (it already hits hard as is, its one limiting factor is its lower defense) adding stats for raid bosses would make them much harder to deal with, and the risk of failing would go up, possibly to the point of being unbeatable if stat boosts happen enough.
I would be interesting if they add it, but it could cause some problems with raids if stats get boosted too much.