There are significant costs, time, and red tape involved.

The video with ten red flags you talk about people that want to plant gardens or flowers being a red flag.

I remember having a brick fireplace painted and they painted it bright red, very odd looking, our normal spec was grey but we didn't do a full scope as it was just a minor rehab, paint and carpet. 

They are looking to break their lease 3 months early (red flag) for a bigger space as they work opposite shifts and live in a small two bedroom. 

Anything above $1500 rent is cash flow so obviously, anything below $1500 is breakeven or loss.The market is red hot.

All it will likely do is confuse them and raise unnecessary red flags.

To me this is not a big concern because it is my plan to repipe after closing, then I will be able to show proof of the repipe and get the exclusion lifted.However, not being able to get insurance with FULL coverage due to the piping, I believe it would be a red flag for the lender and may be reason for a denial. 

When we get into the inside I see hairline cracks in the ceiling and on a few walls, big red flag.

Late rent is a red flag.

I would know that the tenant ignored many opportunities to work with me before it came to a red tag and they chose not to.