Actually, Samsung "stole" AoD. The first phone to have an Always on Display was Nokia, on their Symbian phones about 2010. Motorola (when they were owned by Google) seems to have been the first to have AoD on Android, though they called it Active Display, when they built the original Moto X about 2013. Samsung didn't release a phone with AoD until 2017.
The 3a reminds me, at least in being a great phone that doesn't have a flagship processor, of that original Moto X. I was disappointed when Google sold Motorola to Lenovo; Motorola just hasn't been the same.