300 cd/m is plenty for indoor use, unless you care about HDR.

A shame for an otherwise interesting tablet. The HP Dragonfly Pro Chromebook sets the benchmark for me with a 1200 nits matte screen.

Some years ago people often advocated using 120 cd/m2 for colour calibrated panels, so it could be worse.

That still is the default calibration target for Calibrite/X-rite calibrators.