A top-left logo, linked back to the root page, is part of the design language of the web. I suspect a proper A/B test, of users attempting to complete common t

A top-left logo, linked back to the root page, is part of the design language of the web. I suspect a proper A/B test, of users attempting to complete common tasks (as per Jakob Nielsen's usability tests), would find customers slowed by the logo's absence. But by all means, collect the data. (I don't see data here except for an assertion that the overall page design works. Well, maybe, but test the specific suggestion.)