In today's game, would you agree the differences between LBs-DBs-Ss is closing?
I mean, most teams are in a subpackage the majority of the time. Within those personnel groupings, you have coverages that require almost each player to know, understand, and apply what happens with their role and the role of the other players in their assignment.
Some college teams even effectively split their coverages - e.g. half the field playing man and the other half playing zone. There's an entire group of coverage defenders linked together.
Take the "MLB" (I presume maybe Mauioga?) as an example. Against a lot of modern offensive formations, where you have 3 receivers to a side (3 x 1), that MLB dude has to make multiple decisions immediately. And, depending on that decision, it ripples across multiple defenders.
So, yeah, everyone has to process information and communicate whether you're a Safety, Nickel DB, Outside Corner, or LB who's now something like a Nickel player also responsible for a run fit. Personally, I like it. I think defense is fascinating. I think this trend illuminates "football players" over specialists.