XBox and Epic absolutely do fall in that category. People, myself included, detest using either of those stores, because of their poor implementations. They're slow and unwieldy. The Xbox store on PC is actually so bad. I bought Forza as a chill on the couch and relax kind of game and it is one of the most regrettable purchasing experiences I've ever had. The Epic store is just outright unpleasant software.

The Epic store will only show me prices in Rubles. Never tried to debug it -- who needs it, anyway? -- but always thought that was somewhere between bizarre and hilarious. (US computer, US IP address, no VPN, en-us locale.)

The Epic store might not've been slow, but it was missing so much. It was launched with almost no features, not even reviews. They also didn't have any communities/forums/groups.