It’s most likely just because of new codecs. If you got a newer cheap device it would probably not stutter (until the next round of codecs, but Apple TV requires the same upgrades)
I don't think so, x264 and x265 haven't changed in the past 12 months, or even the last 2+ years. My suspicion is Elgoog releases Android system updates without thoroughly testing them on existing released hardware.
My friends have Apple TVs that don't stutter, for 3+ years.
