Re: Why not just grow up?
Problem is they do not just work out the box.
Buy your typical consumer Win PC / laptop with Windows on and you have to do an install of windows ("automated" but still time consuming - especially as after install drearily completes get Mb / Gb of updates to download depending how long PC has sat on the shelf and how many weeks of Win updates it is behind ).
Working out of the box would (to me) imply an OS already installed and admin and bog standard user added (you are supplied with the usernames & passwords obv, and then free to add other users).
What would be more useful to me (& possibly other consumers who do not intend retaining the "installed" OS) would be info on any issues with installing another OS on that PC - would save a lot of dreary web searching to see if any issues with Linux on a particular manufacturers model