I don't know what's the target audience for this tool, but as a designer I have to say that I could never see myself using this because of the overwhelming UI.

Tools should aim to be as invisible as possible and this applies especially to design tools. The UI should be based on neutral gray colors, so they don't conflict with the colors that I'm using in my design. There are a ton of colors that don't work with the purple background and the neon colors you're using in icons, and if I would have to use those colors the entire experience would be a nightmare for someone who's paid to be obsessed about every subtle tone.

I don't want to be forced to use certain colors that work with the UI of my design tool, just so I can breathe when I'm designing. I want to use colors that support the business needs of my clients.

Again, why is this sponsored? Last time Adobe bought a sponsored spot here it kind of backlashed. I might be paranoid, but it seems to me that this is masked advertising, to avoid the backlash.

Feels very dull.

I never really liked how they presented their design system. The previous version felt a bit too design-ish in the detriment of good UX, and probably that's why they changed it so quickly. This version feels like something you'd build with Google Sites and the typography is not that good imho as it doesn't drive your attention intuitively as you go down the website.

Yes, but this is DesignerNews. He should have shared this on some mom and pop subreddits.

Right.

It's also responsive, the first breakpoint has the header and 4 columns.

Not very good. Sketch is considerably slower and crashes often.

The homepage is a bit confusing, I first thought this is just a collection of products, as it is stated in the footer. I was surprised (and so happy) to discover that you actually have well organised patterns and I personally think that's the juice. I would make it more obvious that you include patters (maybe by having a "Patterns" item in the top nav). Anyway, I am really happy that someone finally did something like this!