I think every philosophy involves tweaking. I agree on the planet theory for DT's, however the 6'5 270 lb DL used to be more of a rare occurence, and so it made sense philosophically to put a premium on those guys. Remember back when we used a 6th rounder on Rufus Johnson? That was a time where you might find 3-4 of those guys in the draft, so you took a shot.
Now, they are a pretty common sight, but the "rush specialist" role is now expanding where team would be smart to have a guy who does just that. Those guys come in diff shapes and sizes. Look at guys like Haason Reddick...
I absolutely think there should be a tweak in edge rushers, but not necessarily those dancing bear DT's. Those guys are worth their weight in gold.
Everything happens as it should.