I contributed to several Wikipedia articles over the years (~50-100). It's gotten to the point where it's pointless to improve even terrible articles like stubs as basically everything is automatically reversed. At best a mod may decide to add your content back, which means at this point it's basically stopped being a public wiki.
Which is fine, IMO they should just change the name to Webpedia or something if they don't want new edits.
PS: As to being 'full' they have 2.7 million stubs, that's a lot of missing content. https://en.wikipedia.org/wiki/Wikipedia:Statistics