An article from Evan Minto did the rounds on Medium a while ago: "Pixels vs. Ems: Users DO Change Font Size", and I posted a couple of comments which I'd rather didn't disappear so I'll summarise them here.
There's an ongoing kerfuffle about DRM (Digital Rights Management) being implemented in browsers and whether the W3C should publish a standard ('recommendation') that provides access to DRM content.
An overview of the potential Graphics Contrast criteria for WCAG 2.1, and a request for examples.
There are some interesting discussions on customisation going on with the work on WCAG 2.1, the much anticipated (I hope) update to the Web Content Accessibility Guidelines. This is a little inside-baseball, but I've tried to make it understandable for a wider accessibility-audience.
Shadi Abou-Zahra and Eric Velleman spoke about the "Website accessibility conformance evaluation methodology" (WCAG-EM), i.e. how you test an entire website for accessibility.
Jeanne Spellman presents about ATAG version 2, which is at a critical stage in the W3C process. If you are interested in web-authoring tools, please read this.
A post came up in my feed called the BOMB in the GARDEN by Matthew Butterick. I found it... frustrating. I don't think the solutions would help with the issues he raises.
I've recently been struck by a parallel: the differences between usability and accessibility are very similar to the differences between writing the HTML5 spec and covering accessibility requirements. Perhaps that can help explain the friction, and why WAI-ARIA is needed.