As long as there is a Focus token and you keep it, which is something you want anyway most of the time in order to regen a shield with R5-P9 (unless you run R2-D2), you can modify 2 dice per turn instead of one on Luke. Unlike Luke you can do it on offense. With the same upgrades he will always have an Edge actually. And situations where you want to spend your focus are pretty rare actually, uless you would die otherwise or gain 2 hits. But these situations also apply to Luke.
Everything you are saying is predicated on those ships taking R5-P9 and keeping the token to fuel the shield regen. Poe's ability does work better in that case but now you have a ship that is extremely dependent on having to take a focus action. If he gets a stack of stress he loses both his ability and his shield regen. If he needs to boost he gives up both his ability and his shield regen. If he has to use a red maneuver he gives up both his ability and his shield regen. If he gets blocked he gives up both his ability and his shield regen.
Having more synergy with one particular upgrade (that isn't even an auto-include on Poe) is a far cry from your original claim that "he [Luke] would be bound to be a worse Dameron Poe in a T-70 with its old skill" .
If Poe has a focus token when attacking he can change an eyeball to a hit or spend it to change multiple eyeballs.
If Luke has a focus token when attacking he can spend it to change any number of eyeballs.
If neither of them have a token, no one modifies anything.