Guild Wars 2

The Problem:
Transmuting a skin to a stat piece couples them together so that they can only be decoupled by destroying either the skin or the stat combo. This will be even worse with ascended armor.

The Example:
-Transmute cultural tier 3 skins to ascended armor
-Want to be able to swap between aetherblade skin and cultural tier 3 skin
-Therefore must created a whole new set of ascended armor to hold the aetherblade skin (taking presumably months of work), or transmute over the tier 3/aetherblade every time you want to change (losing 100g or 800 gems in the process every time)

The Solution:
Change transmute stones into “unlock stones” which when used on an item with a skin permanently unlocks that skin in a PvE locker which can then be used an infinite number of times a la zenith weapons/armor.