Can you substantiate that or is this just flaming?
I'm sure they could come up with a list of language decisions they disagree with.
I'm equally sure that if you asked kubb, kaba0, and three other strongly opinionated folks for a list of good language designers, each of the <5 lists you get back would be very short, and there'd be no overlap between them.
They are huge names in the field, but honestly, they just suck at language design itself.