Only thing I can't disagree with is 'There's more to Striking than Muay Thai'.
Muay Thai is the most well rounded form of striking. The traditional Thai ruleset makes it somewhat kick-heavy, as punches aren't scored as high as kicks or knees. That much is true.
However, look at fighters like Buakaw and Sittichai. All they had to do was brush up a bit on precise boxing and they are suddenly capable of dominating world class fighters, like when Buakaw was the most feared draw of K1-MAX.
Imo, arts like Kyokushin, Boxing, etc, definitely need to be practiced alongside MT, but ultimately they must be trained to conform to a Muay Thai ruleset. If not, the Kyokushin Karateka and boxers will easily get low kicked and tripped to oblivion, while Dutch Kickboxers would get annihilated in the clinch.