Creation of Web APK’s should be open to all browser on Android, it’s just not ready yet as the installability needs — we committed to delivering this in the original blog post about it.
“I know some people at the Chrome team is doing an outstanding job, but some things (such as WebAPK) are taking too much time to get ready (I tweeted about it 14 months ago).” — I think this belies the fact that people seem to think that Google is able to prioritize everything all at the same time. Every product has their own priorities for the long term success of their projects and when inter-org priorities come in to the story then it takes even longer to get created and shipped. For me, the TL;DR is it’s hard, it’s good that things are moving in the right direction, but it’s not a case of “it’s Google, it should be solved immediately”.
