Isn't branding API familiar?

Many merchants are customizing their online store themes, but I seldom see stores which customize checkout look-and-feel using branding API to correspond with their storefronts.

I know this api is only available for plus merchants, but they have budgets enough to pay for it (I think).

Isn’t styling the checkout page paying for extra cost important for them?
Do you have any idea?

Sorry I’m not sure exactly what you’re asking here, do you require help?

It’s possible that if you’re seeing Plus merchants that don’t have branded checkouts, they may not be aware that it’s possible to customise it - or it’s not as important to them as other aspects of their store?