There’s so much choice available that customers can pick and choose who they buy from and where, when, and how it happens. They want to discover, research, evaluate, and purchase on their preferred channel. Give them that option, and they’re more likely to choose you. That’s the whole point behind the multi-channel approach.
Agile projects involve close collaboration and very fast feedback loops. When it works, users' expectations are closely aligned to the project deliverables, and very little time is wasted on nice-to-haves or perfectionism that has no business impact. Agile done right is a thing of beauty, and economical to boot.