The idea is utility for skill-use leveling system without global skill levels(i.e. one character levels skill for entire account).
Skills can be transferred by selecting a skill in "transfer mode", which resets current character skill and grants it to another character of player.
This allows to reduce skill-use grind associated with grinding and since skill-use systems don't have respec(all skill reset) it allows to rebuild with the same class without re-grinding the same skill the player leveled with old character.