So having +value points on both melee attack and melee damage isnt the cleanest way of giving specialization to a unit, safe to say the cleanest way is to give a bonus percentage to the affected stats (even melee defense could be involved) so situations like a unit that has 30 m.atk and 50 m.dmg and +10 bonus vs Infantry wont have the m.atk highly boosted and the m.dmg less so, there are also units with splash attacks that get way stronger from +value points bonuses and charge bonuses