The reasoning for that person's intent to purchase the game on EGS is interesting (because it mirrors mine for a different game in a way).
There are many games where the regional pricing is way better on EGS than Steam, but that's not because the dev/pub set the price, but in fact, because Galyonkin sets prices there manually. So for instance, Jedi Fallen Order is US$14.99 on EGS in Argentina, vs US$45 on Steam in the same region. I highly doubt that EA decided to be good guys and set the price to that on EGS (they don't even have regional pricing on Origin since people from US/wealthy EU countries abused it and bragged openly about it years ago).
So there are situations where people end up buying games on EGS thanks to Epic setting way lower prices than what the publisher wanted to set their game at. Of course this has a lot to do with publishers not understanding regional pricing and setting unrealistic prices in regions that can't afford them, but Epic is using that to their advantage since they control the prices they set on their store (at the very least until the affected publishers reach out to them and ask to change the prices).
I found that whole thing funny, since even before EGS was a thing we had
Polygon attacking Steam with all sorts of stupid stuff, and saying that regional pricing equals "forced discounts" (when in fact, developers can choose to ignore Valve's suggestions, as all the big asshole pubs are doing now).