99% of people publishing at top conferences are not particularly technically skilled and do not want to waste time adopting a new platform, because the competition is to publish papers and nobody cares if you do that on an AMD machine instead of an NVIDIA machine.
The best funded labs have research developers whose only job is to optimize implementations. However these same labs will have the latest NVIDIA hardware.
The best funded labs have research developers whose only job is to optimize implementations. However these same labs will have the latest NVIDIA hardware.