Branding is more than a logo – it is your whole business, and every part of it needs to work together in the same direction. Getting customer experience, customer service and every touchpoint consistent and aligned lets you communicate your core products and values clearly, and explain why customers should choose you over the rest.
This does not mean sticking rigidly to one design forever. Marketing collateral can stay interesting across different formats, as long as everything is in alignment, speaks with the same tone of voice, and sits under the same brand identity.