The communication has been awful and the seller is furious over the one week delay, mostly because the lender will not commit to a date.

Qualified Intermediary shall have no obligation to inquire into the truth or evaluate the merits of any statement or representation contained in any notice, document or other communication reasonably believed to be from Exchanger, its officer, attorneys and other representatives.

Any other requirements on the seller to do this correctly ?  

Some of what they are saying is correct, like having a separate bank account to hold security.

Anyone who has actually been active in this space will know that borrower behavior can be predictable and irrational, and they might have a fundamentally different mode of operating their life than you do.Along with viewing the world your way, many think "their way" is the correct way so that is how it must be done.

It’s one of the mistakes many investors make by not titling their real estate correctly from the start.

somewhat correct - If property A is non-passive, you wouldn't be able to net it with other rentals that are considered passive.

It's only nerve-wracking if the host hasn't set clear expectations; I communicate to guests on the front-end before they ever book what, how and when they will receive information from me.

Would I be correct in thinking of it that way?

She has been making mistakes sending the bill for premiums to the correct mortgage companies as well.