I am a bit shocked by how popular this game is. All the signs were there, though. - Their previous game Divinity: Original Sin 2 was critically acclaimed, very popular for a pretty hardcore CRPG, and had long legs. - DnD has a lot of brand power and has been strongly in the zeitgeist for years. - There's a big cohort of millennials who have strong nostalgia for Baldur's Gate and who have plenty of money to buy games…
Many people will claim "graphics don't matter", but the reality is that they do help.