Fair is fair.
I don't understand people getting annoyed with these reasonable complaints / feedback about the system. More so its crazy that people will defend it because its not effecting them (or they revel in people being mistreated due to some deep underlying internal issue)
Customers should be treated with common decency and respect. Its not unusual to look after your customers by understanding their views, how they think and feel about your business practice and provide an appropriate level of compensation when issues arise.
People are highly unlikely to have crafted a set of "non-mistforged" (or any of the other examples of duplicate legendary sets that are not fully unique) for minor skin differences.
Any compensation given to such a small percent of players in this unfortunate situation wont impact the economy or effect the other 99%.
I hope Anet handle this in a fair and sensible manor.