I'm going to program a bot that just auto-posts this link that is relevant to your situation: What Overlays Are and How They Kill Mortgages.

We aggregate them, roll them up, and provide a nice overview of all deals relevant to their buying criteria.The wholesalers would pay a single monthly fee for the privilege of marketing their contract deals on the platform.

Generally they want to see that the sponsors have relevant experience.  

Is neighborhood analysis really relevant like it used to be few decades ago but not so much today?

I can owner build rental properties but must disclose any non-Licensed work on sale (I do not sell so not relevant in my case).  

Not sure what else is relevant. 

<not necessarily relevant for asking for a loan, but certainly in doing most (if not all) other business transactions>

There are limitations set out in the language of the law unless there is some local law that is relevant.

However the basic concepts (and that's what they will always be for $300, in America you get what you pay for) are still relevant to this day.

Probably a combination of issues; perhaps "fishing in the wrong pond" for subs, a few miscommunications with a quote from a sub based on a description as opposed to an actual inspection,  from an owner that, not being an AC person may miss relevant issues, are these new or used units, did the handler "fit" into the enclosure, etc.