In reply to Rose Sebert.

Fields API was an effort I and a few developers put forward for a few years. We just couldn’t get traction or buy off from people who could put weight behind it. We built like 3 different versions of it based on feedback we received. Everyone thought it should be done a certain way and I couldn’t keep pouring my heart and soul into the project. Unfortunately Fields API was a distraction for me where I wasn’t able to do feature development for Pods for a bit (our other developer was focused on bug fix development).

I tried to push Fields API forward many ways and I just couldn’t get enough traction. I ended up announcing my departure in the WordPress Fields API channel in July 2018 — https://wordpress.slack.com/archives/C04MWK7PZ/p1532461483000439

Automattic nor Matt Mullenweg directly put roadblocks in the way for Fields API, there were just other priorities like REST API and then Gutenberg.