Graphical fidelity isn't the problem today already. You have Epic Megascans, online asset libraries where you can buy crazy high quality models for dirt cheap and whatnot. However, the new visually high quality games that come out (and have a download size of 20+ GB for a top down game) don't necessarily do well despite a marketing budget. In contrast, games with very little budget but a unique (and sometimes crappy) artstyle and compelling gameplay loop can do crazy well if they scratch an itch and/or are good at talking to the press. I mean, look at Brotatos artstyle... just... look at it.