Switch 1 had a 720p screen with a 1080p max TV output. That’s approx a 2x increase in throughput.
With Switch 2 it’s expected to be a 1080p screen and a 4k output, that’s a 4x increase in pixel throughput. So a 2x output increase might not be adequate.
However, it is widely expected to have DLSS, which would greatly reduce that requirement.