Not really related to the letter but more to the responses...more of my .02
Thatch is a result of grass growing, and usually growing well.
Bad soils, bad water, bad this or that also prevents grass from growing well usually also prevents thatch from accumulating.
If you accumulated a lot of thatch, then at one time that soil was growing grass just fine. What changed?
Yes, thatch can get away from you, but this idea that to reign it back in is some sort of maddening decade long process is BS.
This industry goes based on work, rebuilding is work...thus most in the industry, labs, construction firms, suppliers, architects all benefit when something is rebuilt.
Yes, sometimes things need to be rebuilt, but way to often that is the first option and not enough questions are answered prior to the rebuilding suggestion.