Reminds me of the Tyrant set in the EA.
By the time you finally get it... The upgrade is marginal
You mean by the time you get it you can find better at merchants, ... I made a post about it a while ago comparing the random loots with the Tyrant Pieces.
I'd personally much rather only have unique items at higher level, I am not really a fan of a scaling weapon. If it scales too well you find a weapon at level 4 and won't change until level 15? Meh. If it doesn't scale well enough it's not really worth it anyway.
In the game you should only start to get very few purple, red, unique items at higher level like 15+ (considering level 30 is max) and then get more and more. And the Divine ones (yellow) only at like 20+ (Those are approximate obviously).
It increases the feeling of progression.
In DOS 2 you find "legendary" (purple and even a few red) level 9 weapons ... Hardly legendary when another weapon level 12 green will be better. Now I don't mind Big bosses giving great loots but I don't really like merchants having those.