Again. Multiple baskets will always be smarter than a single basket with everything in it.
As others have said, the single-basket concern is perfectly valid. The reason you're getting pushback because you have a single-minded focus on that one concern and vehemently deny the possibility that there might be tradeoffs. That comes across as an irrational attachment to a single issue, even if what you're really trying to say is that your assessment that enough other baskets have hit a good-enough baseline that diversification is a good strategy. The latter is something you could have a productive conversation about. As for the former, you can insist that multiple baskets are the only thing that matter until you're blue in the face, but I doubt you will convince anyone.