A brand voice is not a slogan; it is the accumulated impression of a thousand small choices. The kerning in your wordmark, the pace of your copy, the silence between sections — all of it speaks before a single product is shown.
Consistency is the real signature
Choose three adjectives for your brand and test every screen against them. If your adjectives are “calm, precise, warm,” then a flashing discount banner fails the test no matter how well it converts this quarter.
The brands that endure are the ones whose customers could identify them with the logo removed. That recognizability is built slowly, page by page, and it is worth protecting fiercely.