: Paradox Interactive released a series of deep-dives on the mechanics of v1.15. You can find the Plazas & Promenades Dev Diaries on their official forums, which explain the math behind the pedestrian area logic.
: YouTubers like City Planner Plays have "blog-style" video essays that break down how to actually use the 1.15 features to build realistic, functional cities without the traffic nightmares common in earlier versions. File: Cities.Skylines.v1.15.0.f7.Incl.ALL.DLC.z...
Since you're looking for an "interesting blog post" related to this, I've outlined the most impactful topics from that era of the game: : Paradox Interactive released a series of deep-dives