Getting the app for 20-30% less money would seem to be desirable for the users.
Here is my fear. I like most, not all, of the restrictions the App Store puts on apps. If there were alternative app stores developers might only provide their apps on those stores that don't provide the same user protections I value. This is why I would prefer Apple to resolve this without allowing other app stores. I think this could be done by adjusting their rules and reducing the amount they take.
I'm sure if there was true competition in the app store market, other app stores could be more efficient with the 30% cut that the App Store takes, and pass the savings off in order to compete with rival app stores that take 30%.
"Epic’s CEO Tim Sweeney has effectively thrown down the gauntlet to Valve, saying that if Steam matched the Epic Games Store in terms of dropping the cut it takes from developers to 12%, Epic would stop pursuing the policy of securing big-name exclusives."
The entire point of the EGS is to get the industry to lower their skimming. And you don't even have to invoke altruism: if Epic continues to take 12% of every transaction and grows the market ten-fold, that's still more than a 30% cut of the market today.
It is a sad testament to our time that it is inconceivable that a person just wants to better the situation for all involved.
I'm a game developer and the EGS is the best thing that's happened to us as developers AND to us as gamers. And our games aren't even on the EGS.