It only cements what I have long been doing as "the way". 

Some flippers just were hit with almost $800,000 in fines for improper removal of asbestos cement siding on one house: https://ohsonline.com/articles/2019/01/25/asbestos-violations.aspx?

Only contracted out the cement, Sheetrock, well, and asphalt driveway.

From cement, studs, flooring, etc.

It makes it very easy to find customers even with bad support.I am leaning towards going with the click plank option as I was told, that when it clicks together it adds another substrate or "floor" basically and that with the attached underlayment does a pretty good job of reducing noise.I looked at adding gypsum concrete (gypcrete), self leveling cementitious subfloors, wool insulation under the plywood, and another type of cement type floor, but they all have their pros and cons and doesn't seem to be worth the extra money in the end. 

To allow that money to go to waste would be a shame and would likely cement in stone that I would not go any further than reading or posting.To summarize this post, challenges can either be your motivation or your demise.

Exterior was the wavy pattern fiber cement siding and was easy to match.  

The Unilin 2g locking system is one of the most efficient ones on the market.I 100% agree the the subfloor/ underlayment/ substrate being attached to as well as how  it was attached to the builder floor(naturally we're not talking cement) is usually the problem in a failed installation. 

Another we looked at was physically in two pieces, a left house side and a right house side with a crack 1-3 inches wide through the cement floor front to back. 

The backyard was mostly broken cement and terrible metal fencing.