That's a tough one. I agree with the sentiment behind what he's saying. The smaller films are great, but not something the majority of people go to the theater for. American fiction made 22mil on a reported budget of 25mil. I'm sure the advertising budget was fairly small. So even at 5mil for advertising, the film lost almost $40mil. Not really a ringing endorsement. Would a bigger advertising budget have helped? I doubt enough to push it past 70+mil at the box office. The answer is probably, every film doesn't need to be 200/250mil plus event film. Just be smarter with the budgets.
With streaming what it is, I think it is doubly a mistake to think of box office-only when it comes to the profitability of small releases.
Not small budget movies, but Apple has allegedly reported that both Napoleon and Killers of the Flower Moon were a financial success despite what BO math on your napkin would tell you about them. [Source: https://variety.com/2024/film/news/...ires-napoleon-flower-moon-argylle-1235931957/]
ETA: No idea where you got that budget figure for American Fiction. I see "significantly less than $10m." [Source: https://www.screendaily.com/feature...jefferson-to-american-fiction/5188935.article]