That reasoning isn't wrong, though it seems ridiculous when looked at with techie-brain. But if there is a standard expectation of what serious company websites are like, it makes business sense to look like that too. It's like dressing up appropriately to cultural expectations. You can deviate somewhat but you have to strategically spend your weirdness points.
How nice of the EU to have determined for the rest of the world that the “cultural expectation” should be that every business do the design equivalent of wearing clown makeup.