Creating a definition of a word to turn your opinion into a fact does not make it so. You seem to think having more buttons makes two things less alike in some quantifiable way, but in my opinion when the outcome is broadly the same, there is no real difference. That is why emphasizing role first creates homogeneity. In my opinion. It’s as true in 4e as in World of Warcraft: you can fiddle with the details, but what really matters is whether you can use them to pull off the key elements of that role, or not.
5e, and the artificer in particular, put class and subclass identity first. That’s all I’m saying. I’m not going to continue arguing with you about why your beliefs are facts but mine are opinions.