Ill tell you the same thing i tell my neighbors lol. The name "IPA" or india pale ale comes from the history of when british Sailors would take beer in barrels out to sea to go through the East india Trading Route. The beers would spoil throughout the trip, but brewers learned that by overloading the hops, the oils preserved the beer longer. So they took their normal pale ale recipies and overloaded the hops and called it the India Pale Ale to differentiate the barrels for the sailors and the beer for the taverns. Over time, our palets have learned to associate the name with the extra biterness, but the beginnings of an IPA was really only about 25 or so IBU's, not the 80+ ibus of today.
Just like with anything in our world, humans evolve and with them so does or knowledge, technology and creativity, the yesteryears of high ibu, high bitterness that "defined" the style is just simply evolving. BUT history always repeats itself, its only a matter of time that we find our breweries and ourselves for that matter, striving to reach the outer limits of IBUs and it will be a race for the most "dank, piney, resiny" beer to hit the market with whatever hops happen to come from all the mixed breeding.
SOOO, sit back, relax, enjoy the scenery and for god sakes, keep an open mind as we all explore new dimensions and new flavors