We went to E3 in 2017, as my wife got us a pair of press badges for it, which meant we got in ahead of the unwashed masses.
I knew everything that was there two days before we saw it, because the companies couldn’t resist being the first to spill the beans on their announcements. As a result, it was rather unexciting. Sure, there were booths set up for games that were kind of neat to see, but honestly we felt done with it on the first day there.
I think this may be the end of E3, as companies will find there’s JUST as much buzz for a game if it’s announced online. It saves everyone a bunch of money and doesn’t force companies to cobble together a demo that’s got a strict deadline.