Separates or Integrated? What makes more sense?

Not to say there aren't some really nice integrated amps out there but in my present system my power supplies for the preamp and phono pre are separate. The makers of these probably wouldn't go to this trouble if it weren't a step up. I mean I guess they could take this approach for panache but they probably are more concerned with performance.
When you locate the power supplies in the amp box with preamp, and power amp and in some cases phono pre it would seem to present a problem with noise, something my system with high efficiency speakers is particularly sensitive to. So separates it is for me. The longer I'm in the hobby the more aware I am as to the importance of the power supplies. For the more knowledgeable designers of equipment on this forum, it would be nice to hear your honest appraisal of the significance and differences involved in isolation of the power supplies, benefits and drawbacks.

The technology may well be there to keep the noise floor down with an integrated and don’t think one can assume a superior sound with separates.Thinking here that a separate power supply for the integrated would certainly have advantages. I will say though, lowering the noise floor had been a big deal in my system. Would think the industry people know to a pretty fine degree how much the noise floor is compromised in an integrated and would understand their reticence in addressing this on a public forum.