I guess the underlying question is - can I have articles that similar feel to a Medium post (Large featured image with overlaying title, scroll for article - https://medium.com/help-center/images-652ee60abea6 )
We are trying as much as possible to take inspiration from Squarespace in that our main focus is the User Experience.
Anything decision we take with Layers has to meet our UX expectations before being added, which I think is something lacking from the WordPress industry at the moment, features are added but are not usable, which sucks for the end user.
We want to fix that as much as we can.
Regardless: under the Layers paradigm, "Blog posts" are a widget. So you might build a page for viewing one blog that is centered around a Posts widget, then maybe make a second blog the same way, and then a combined archive, etc.
I like the approach but it feels a bit frankensteiny… but I only gave it a cursory look. One thing is for sure, Squarespace has set raised the standard that Wordpress has yet to meet, so something like this needs to happen eventually.