Ever since amazon managed to making a competing Android release with everything Google stripped out, the SDK licenses have intentionally been made very onerous,

Ever since amazon managed to making a competing Android release with everything Google stripped out, the SDK licenses have intentionally been made very onerous, it's become nearly impossible to get your own SDK extensions put into the SDK manager, and Google has been moving as much as possible into private extensions like Google Play Services. They even strong armed cell companies into breaking contracts with GPS provider replacements, like SkyHook. I worked for an OEM at the time Google kicked us out of the SDK manager update list, so am familiar with the about face. If you do try to make your own toolkit, you'll have to fight very hard to do so. JetBrains writes IDEs and licensed Android Studio to Google, so there's no harm in Google helping them, but anyone else would be in for a lot of pain.