So simple it's presented on a page with dozens of subsections. It should present a simple version like your 5 points and link to the longer version for the few outlier cases or rejections.
It's repeated for every single policy page - they are enormously long and complex for every single topic. There is nothing remotely like a friendly beginners guide to helping - be that fixing some poor language, or correcting a mistake. You have to plough through the meta Wikipedia policy encyclopedia and figure out what's relevant or not the hard way.
On my experience many moons ago, Wikipedia was one of the most hostile sites I've ever encountered for new users. I dread to think how a subject expert who isn't also an IT expert finds it.
Reading through that page, it feels like a case of the core rules being really simple, but a lot of ink being spent being very particular about defining the edge.
> This page in a nutshell: When choosing an account name, do not choose names which may be offensive, misleading, disruptive, or promotional. In general, one username should represent one person.
Seems fine to have the sussinct description at the top followed by details on the same page. If there really are lots of people that have issues picking a username (these policies seem petty typical so I’d expect most users to be fine) then a link from the create account page would be a good idea.
I don't seem to have been clear enough: it's not just the policy, but the ways in which the policy is applied.
For a few years the new username lists were trawled by vandal patrols and there was a lot of biting of newbies -- so much that "don't bite the newbies" had to be added to the policy pages.
For example: the section on "confusing usernames". This was added to avoid people suggesting they were a bot account if they weren't a bot account, or were an admin if they weren't an admin, or to prevent impersonation.
So, if you register as "kjwenflkjclnaksdnalmsd" that's confusing, but it's not against the policy. Except a lot of people reporting usernames hadn't bothered to read the policy, and so they were just reporting names like that as confusing. For sometime people using their real names in a non-latin script were being blocked because their name was "confusing". This again led to changes in policy.
What WP really needs to do (and what they've actually done) is have a bot that checks usernames and places them on a list with descriptions of the problems, and warnings about why it might not be a problem. (There are differences between "WhitePower88" and "MartyJenkins88") -- and then have people checking the list.
It's repeated for every single policy page - they are enormously long and complex for every single topic. There is nothing remotely like a friendly beginners guide to helping - be that fixing some poor language, or correcting a mistake. You have to plough through the meta Wikipedia policy encyclopedia and figure out what's relevant or not the hard way.
On my experience many moons ago, Wikipedia was one of the most hostile sites I've ever encountered for new users. I dread to think how a subject expert who isn't also an IT expert finds it.