Thats what makes the wiki format so great. When I have no clue what a word means, it's probably blue and I can just follow the link to find out. The problem arises when I'm 20 links in and realize "yeah maybe there's a reason people have phd's in this topic".
https://simple.wikipedia.org/ is a good alternative sometimes and I'm glad it exists, but that's almost the opposite problem.
It does seem like they make an effort, their style guide starts out with "Probably the hardest part of writing a Wikipedia article on a mathematical topic, and generally any Wikipedia article, is addressing a reader's level of knowledge." https://en.wikipedia.org/wiki/Wikipedia:Manual_of_Style/Mathematics