What happened to MicroPow/FASTER

I thought MicroPow discussed 4 years ago was abandoned, but then I found the same concept, or a simplification of it published last year as FASTER.. but I can’t find an RSKIP, or a post here, or any other writeup anywhere.

My questions are:

  1. What is the status of this line of research?
  2. If this is a valid direction, why not put the entire PoW headers in the bitcoin Coinbase? It shouldn’t matter if PoW blocks are produced every 30s or 10 minutes, if PoS blocks are produced every 5 seconds.. right? It should simplify the security of Rootstock significantly as @SergioDemianLerner mentioned many times that having the same blocktime as Bitcoin makes securing sidechains much easier.