Plus it’s not like there wasn’t room for a good shopping client, if you go smart about it.

Steam had at the time - and still has - tons of bad UI design, stemming for its very old layouts wrangling with newer client additions and changes. Plus Steam for the longest time until the new client solved it had serious issues with late boots and hanging closures. GOG had just tried to bring out their own client a few years before, but in the move to GOG Galaxy had gotten a lot of ire and fucked a lot of things up. All the per-developer clients were berated constantly.
There was room there. But Epic, hell, this is so not it. Your client is so much worse than even the bad competitors…