Good question, unfortunately, I don't have an answer...

Why are these not readily available in store,  I find using these you don't stuff screw heads

At this point I have no regrets in my purchase of my Android Auto Screen... 

Famous last words! 

Mine started acting up a while back with Android Auto disconnecting a few minutes after it connected.

I haven't had cause to use it in recent times but decided to give it a try coming home from our recent RTE.
All was good until I tried getting directions using Google Maps...
Google Maps "froze" although I was still able to control my music through it so it had me scratching my head!

Upon arriving home, I found it was actually Google maps on my phone that had lunched itself, and not the Android screen.
Hmm, I uninstalled the app and reinstalled it and it was back up and running!

Unfortunately, it wasn't long before the Screen started to disconnect again so I spat the dummy and decided enough was
enough, time to buy a decent Android Auto screen...

So, this is what I came up with: https://tinyurl.com/3sz4s2k3

I'll post an update when it arrives... 

You could be right, but then again, you may be wrong...