My biggest complaint is that, from what I had read, being on EGS was less expensive to a developer. As such, that could result in this savings on the developers part being passed on to the consumer as a cheaper game.
Same thing that was said when Steam launched, games would be cheaper since they wouldn't involve all the money needing to be spent on getting a game into a store as a physical copy, and yet it never happened due to the need to maintain price parity with the physical copy in the store, or risk losing the box sales in store.
And here Borderlands 3 is, nice payoff to the developer, apparently a discount for using UE4 and releasing on EGS store exclusively, on top of the lower fees to be there than on steam, along with no need to meet price parity with a physical store copy, and yet the game is no cheaper than any other version. No savings passed on to the consumer.