My argument regarding noise in the ASW role was not the 40 kn, but the lack of optimization for low noise - and a lot of optimization for 40 kn.
It is funny to read that there is no concept, which requires that speed - except of capturing speed boats (others would do that with helicopters and have used helicopters to do that).
I am still laughing regarding the shallow draft argument. The ranges of current anti-ship missiles make that irrelevant. But hiding behind an island is a good idea for a LCS commander, because of the limited abilities to defend themselves against missiles aimed at them (even in the upgraded version).