As Chase points out, you only need to fit the Wikipedia criteria to have a page, to be eligible for notability.
In addition, while many Wikitreers are happy making minor edits to WP pages (I am one), they are not comfortable creating entire pages (I am one, or my X-greats grandfathers would have WP pages).
I think it places too much expectation on people to expect them to do more than create WT profiles and note notability here, so long as the person/people are eligible under the stated criteria.
As an example - Australia has many notables who do NOT have WP pages, because there has been no one to create them. That does not make them less notable. (I believe WP even has a "todo list for such.)
As another example, on the other extreme - someone who gained an Olympic bronze medal gets a Wikipedia page as a notable -- even if that was their ONLY ever achievement. Are they truly notable? WP says so.