The ASUS ROG STRIX SCAR 17 also already can charge and run via USBC at 100w, I suspect it clocks down at 100w, but 240w is almost certainly enough to run at full power and just charge slower
My 16" work MBP comes with a 140w power brick but it works with a 65w brick just fine unless I'm pegging the CPU for hours on end in which case the battery will slowly discharge, otherwise just charges slower
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Gamers don't buy gaming laptops if they have to "clock down" to use a standard charger, that won't fly. My guess is that high end laptop manufacturers will need to maintain 2 charging systems like Apple does with MagSafe and USB-C.
Waste of money and resources.