In one patch, we went from dupes being essential for evolving, to now having absolutely zero use beyond salvaging. i think players are already pretty tired of salvage simulator v0.35… If you have a dupe at legendary, the best value you can get out of it is maybe leveling it to 15, then salvaging and hoping to hit that ridiculously low % chance at getting a relic. Even after leveling it that much, you’re still ~98% chance to get nothing. In a game already full of dead currencies, just add dupes to the pile.
If the inability to use dupes is a long term fixture, and not something that was thrown in for short term impact analysis, dupes that are not of a greater quality than what you already have should be auto salvaged. Or there should be an option to enable such a feature.