That's a welcome development albeit late, but more importantly, they should address the "can't link to a highlight" problem on mobile. When all sections are collapsed by default, browser won't scroll to the relevant section.
A random "link to highlight" example: https://en.wikipedia.org/wiki/Henry_I_of_Cyprus#:~:text=On%2...
Such a link doesn't work on mobile if it points inside a collapsed section.
That makes directing people to relevant content on mobile really hard, and I end up sending screenshots instead.
EDIT: "Link to fragment"s had the same problem, but apparently, they fixed it. Thanks for that too!