I don't feel the need to pay a commission for a digital storefront. I know a lot of folks find value in app store/steam etc... but I find almost no value. At the same price, I would rather the money go to the seller of the product and I definitely don't want to pay more for a storefront.

I find the normal reasons people like digital storefronts not very compelling: safety, reviews, all in one place, etc...

I also worry about everything being in one account. If I lose my epic games account, I'm not going to worry too much. If Valve locks me out, I'm in trouble, so I would rather diversify away from Valve if I can.