I'm mostly just curious about this, but as a free to play player I see skill inheritance as a way to enhance your units. It can bring unused units into the spotlight with unique skills and weapons. The problem I see is if you use a technically greater unit to make an average unit better would it actually be worth it?
Factoring that you have a limited orb source do free to play players just buff their rare units, or bring up the lesser ones?
Now I'm not factoring people who pay because in the end we all have to grind SP regardless.