So it’s actually supposed to be the opposite - to meet a legal obligation to highlight to users that they should pay particular notice to certain sections.
Let's say the lawyers decide to be 'creative' and then bold the text instead, and then it gets copied into a page and some CSS renders it without bold text - suddenly the contract might have legal challenges, and the lawyers will rightly be asked why they decided to not follow established industry and legal norms.
I think it's a bit silly too, but if I was hiring an American lawyer I would want them to follow established norms rather than come up with their own unique and legally-untested interpretation of what is required.
(I'm not a fan of it anyway - I'm from the UK and think it's silly, but I've come across this plenty during contract negotiations with American lawyers that will insist on certain sections being in caps)
Does that mean the rest is not important? If so, why include it, or why not make it all caps, and if it's all caps, why make it caps at all.
Unfortunately legal things are about rules and laws, not common sense.
But let's say that WD doesn't capitalise some bits, that might come back to bite them if there is a class action lawsuit.