Typical Wrote up a long description about how the equipment I used for my master's worked (fleshing out a stub article). Only to have some moderator (being extremely polite here) revert the whole thing because it was "uncited". When challenged I ended up getting temp banned for telling them "I know how it works I just built one". Haven't trusted or contributed since it's moving closer to a collective "what we want to…
The point is, that they don't know if you're telling the truth when you say "I just built one", there's no real way to ensure that they are knowledgeable enough in every single topic to be able to figure it out. So they adopted the sensible rule of requiring citations. This annoys people like you, who know stuff that isn't in Wikipedia, because it raises the effort required to get it in. But at the same time it stops…
This isn't about a celebrities haircut.
This is an admin who doesn't understand a topic sitting as gatekeeper on said topic. It doesn't scale and causes problems.
Reducing the barrier to entry is better to encourage engagement. Higher barriers of entry should be needed for evolving topics as is appropriate but the fact Wikipedia has gone this way from my last attempt at a contribution (2004) is sad.