MicrosoftHi Mike808 - there are no plans for backporting Windows LAPS to additional platforms at this time.
Windows Server 2012 R2 is nearly out of mainstream support - I believe it ends on October 10th later this year - so customers should be looking to migrate away from that platform soon anyway.
The mainstream Windows Server 2016 editions still have plenty of life left (mainstream support ending in January 2027) but we had to draw the line somewhere and WS2016 did not make it. I am not going to say we cannot change the decision wrt WS2016, but we would need to hear a lot of customer feedback on the business case justifying why upgrading to WS2019 or later is not a viable option.
I know this is not likely to be a popular answer, but that is where things are at the moment.