I have yet to hear a compelling reason why this would be a bad thing. Are you able to expand on why?
Maybe it's because I'm getting old, but... Why not?
I know that's an age old question in Wikipedia, but if people are happy to write and edit articles about their niche of interest... Let them do it, maybe they'll contribute even more to other topics.
Less obscure topics are both easier to verify and more likely to have someone looking at them and going "wait, what, that's not right...".
I don’t contribute to Wikipedia anymore for the obvious reasons. Now there is one person less making sure that the article on Orgon Energy something states that it’s not a concept accepted by science.
My point is the more articles the less likely is it that a community can maintain the information and reach a certain consensus on what would be a neutral view when phrasing the article.
That alone doesn't meet Wikipedia's requirements for noteworthiness. Some of the sources you used have to be independent. Eg. published biographies written by someone else, an independent TV show about him (not starring him), etc. Otherwise any random social media influencer could be included if they publish their content in various formats.