I've returned to the game after about a three year hiatus, and noted that my back piece (Exotic Elegant Tailors Backpack transmuted to look like Rata Sum Apparatus) had a medallion of the assassin in the upgrade slot. Naturally, I figured it would benefit me to get a crest of the assassin to replace it - however upon trying to apply the crest in it's place - it would not overwrite the previous medallion.
Being uncertain about whether or not you could overwrite previous upgrades like the game was like in the past - I spent 250 gems to get the 3 pack of upgrade extractors. I removed the previous upgrades, and even now it will not allow for me to use the Crest on my Exotic Back piece.
My question is, why is there not clearer descriptions in the upgrades when some of them are not going to be applicable to "an item with an unused upgrade slot." If this is not a bug and purposely intended then the descriptions should clarify when you're about to waste gold buying them and perhaps even gems on the matter. I don't need any kind of refund, just pointing out that even after giving y'all three years to try and win me back over I'm definitely back on the fence regarding buying expansions now - instead of eager to return and try out the new mechanics. Thanks for your time.