Yeah and Diablo III came out 10 years ago. There's no excuse for Diablo IV.
Diablo III was (and still is) dumb mindless fun, it's perfect at what it offers. Diablo IV is just boring, with a cash shop and paid seasons on top of it. Like oh sure, I'd love to pay to get a super nice transmog that nobody except me will ever see since the game is super dead.
Oh it definitely was a dumpster fire while the auction house existed. No doubt about it. But if you try it today, it's a nice over-the-top ARPG.
I'm not talking about popularity here, I'm talking about fun. The popularity of a solo game absolutely doesn't matter.