I guess it's just a marketing strategy. they have to make enough "upgrades"

yeah. Being unable to know the precise position is fatal for professional usage. I hope Apple can provide a better solution

Using Lab space is not new, but the tool they made is impressive.

Basically a font has its own expected usages and specs like letter-spacing, kerning and tracking is set based on that usage. Fonts like Helvetica Now and Apple SF has variation for small text, whose letter-spacing is significantly looser than its default variation.

I've turned to Figma already but it's really good to know that Sketch will have realtime collaboration feature in this year. Sketch will also provide API for 3rd-party apps like Figma API. I wonder how Figma will react to Sketch's change

very impressive rendering speed. I'am fed up with Adobe Dimension's speed...

Overlay in Figma came a little bit late than XD but the final solution looks nice. I especially love the usage of Multiple Overlays & Interactions on Overlays

have you checked this series of posts? https://medium.com/eightshapes-llc/documenting-components-9fe59b80c015

i tried but it doesn't work if the file is imported from figma

Figma. It requires no extension, free for individual use and accessible with single link.