if someone is branding something as white gold, why wouldn’t they go for the whitest shade they could go for?
Not necessarily. Not everyone loves this uber white colour of white gold. The point of white gold, historically, was to imitate platinum which was hard to get for a long time.
Just like everything, peoples have taste that vary through time and cultures.
Also, the advent of diamond as stone of choice has influenced the taste for white metals rather than yellow. Before the 19th century, diamonds were not the favorite stone they are now; people much preferred other stones and pearls.
And the need to replate influences the choice of plating metal depending on whether your piece of jewelry is elaborately mounted or not. Again, that is why platinum is better than white gold as no need to dismantle the piece just replate the damn thing.
White gold pieces are only of interest as stand alone unmounted pieces.
I do not think it’s a taste or branding for a company to make their white gold jewelry actually white, but more so skill. Yellow gold and rose gold is one thing, but gray isn’t white. Yellow gold can have a different look, so can rose gold, but to claim jewelry to be white gold but being the same shade as stainless steel seems to be a lack of craftsmanship.
No. It is taste and choice. Which is the reason you can find all sorts of white gold, legally called white gold, and yet vary from uber white to quasi grey. They are all white gold, because they are all 75% AU with a "white" plating.
VCA have simple settle for a shade of white gold that fits with their branding and that's all. Should anyone else want to reproduce that, they can. It's just plating, nothing technical or even mystical about it.
And the "white" in white gold is just descriptive. It was simply a way to say gold that is not yellow, i.e.e that imitates platinum.
Also, your basis on shade of yellow gold also isn’t true. Yellow golds shade is based on the karat, people in Indian culture like 22/24k gold compared to people in the west who like 10/14k yellow gold
I don't think you are actually understand how gold jewelry is made. Also, you may have issues understanding percentages.
For the same 18k yellow gold, i.e. (75% pure gold + 25% something else) the colour can range from pale yellow to darker yellow depending on the composition of the remainder 25%. For the same caratage, i.e. same 18k.
If you get the chance to travel more, visit souks and stores try and buy pieces from all over the world and compare them. Pieces that are all 18k and officially yellow gold will vary in colour because the of local tastes.
Of course, higher karat gold will be even darker. Again, please consult proper informational and educational material, not marketing material.