first I was say if grapple talent cost an in turn incidental I could see it being a 25 xp talent.
2nd look at the grapple talent now particularly about how an encounter would play out... character with grapple moves to engage, attacks, can't use grapple without spending 2 strain or 2 advantage, assuming they due spend it, the other character uses 2 strain or advantage to back off and fire at a lower difficulty at higher damage, first character moves in, attacks, spends 2 strain or 2 advantage to activate grapple, rinse repeate... the ranged character is dealing more damage from a better weapon against a lower difficulty meaning they're also generating more advantage which means their spending less strain for extra maneuvers which means the character with the 25 xp grapple talent is taking wounds and strain faster than the ranged character. That seems to be a waste of a 25 xp talent, if they didn't use it, the same situation would take place but with neither side taking strain so the melee guy would only be losing in terms of wounds rather than wounds and strain.
now if the grapple talent only took an in turn incidental to activate, melee guy uses a maneuver to engage, attacks, activates grapple as an incidental, ranged guy would then only back off when he has 2 advantage to gain a maneuver, so he stays next to the grapple which means the difficulty of their attacks are equal (average for both, assuming the ranged guy is attacking with a ranged light weapon) and the brawl/melee character gets a boost die on his next attack, the ranged combatant still has a better/more damaging weapon but the boost die helps make things a little more equal, except when the ranged guy gets the 2 advantage and can back off before taking his next shot. all else being equal the odds are still in favor of the ranged guy but the deck isn't as stacked against the brawl/melee guy as it would be without the grapple as an in turn incidental talent. i.e. in that scenario the grapple talent is beneficial rather than harmful to someone who uses it.