Some niche lenders or private lenders might be more flexible with lower down payments if the cash flow on the property is strong.

This flexibility makes it easier for investors to secure financing and grow their portfolio.2.

I thought I was being flexible with the timelines because he had helped with the favors, but it's gotten out of hand at this point.What am I truly liable for?

They sound very flexible. 

Ramit Sethi in his How to Get Rich Netflix series explains that renting offers flexibility and freedom from hazards of ownership (fire, flood, sewer backup, etc etc) and I see multiple posts on social media from people needing to fiind a rental ASAP.

I am usually very flexible and have had the yard cleaned up at the tenant's request; however, now he has requested maintenance every 3 months to be inclusive of his current rent and had a "deal" with the previous landlord. 

Negotiate with the Seller: Depending on the market and the seller's flexibility, you might be able to negotiate a lower EMD or even delay the deposit until a later stage in the transaction.

Simple answer as to pros/cons:Pros: easier to get approved than conventional without your personal income/employment/taxes/assets/DTI being evaluated, i.e. lighter paperwork and more flexibility, usually faster too.

They do this to limit risk.However, some lenders may be more flexible if the deal is particularly strong, and your experience or financials are solid.

Sellers believe that by providing flexibility, they can attract buyers who might not qualify for traditional loans and, in turn, command a better price for the property.This perceived advantage can sometimes lead sellers to agree to terms that heavily favor the buyer, such as zero-interest loans or accepting second-position liens.