I think the way Harman is doing it now is fine. Its not the 80s/90s where they where getting money hand over fist, so back then they couldve done it in secret. With how crazy everything is going on nowadays, I dont think they want to risk putting a huge amount of money tied into it.
At least the way theyre doing it now, its pretty much a "yeah it's a work in progress, but there's something you can actually buy/hold/use while its being improved to a "final"/complete product down the road"