Truth. I think that might be a reason why none of the retail incumbents, not even the ones with a by-mail background, did well. If you were an upstart, by-mail-only internet company, you didn't need to know how to run a bricks-and-mortar retail chain (of large size).
It is probably relevant to consider Amazon's (limited) forays into bricks-and-mortar establishments. They have had about as much impact as the online versions of the legacy retailers.