i1Pro2/3 has too small resolution for W-LED PFS IPS.
CRT displays had pretty bumpy phosphor spectra, and a 10nm measurement was a lot better than none at all.
So I'm not convinced that any White LED/phosphor based displays are much different in terms of spectrometer measurement.
[ Colorimeters are a different story - the predominance of a single display technology with broadly similar
spectra let the manufacturers get away with with some pretty loose emulation of the standard observer.
The range of modern display technologies is much less forgiving. ]
It comes down to the level of accuracy you are after, and whether steep transitions in the display spectra happen
to land on steep transitions of the observer model.
A lot of the accuracy is illusory anyway - the calibration chain and consistency of measurement instruments that are
affordable to mere mortals (i.e. < US$100K) isn't all that impressive when you start trying to measure narrow band
light sources and compute the perceived color. I wouldn't be surprised that if you lined up 3 or 4 spectro's in the
$5K - $50K range and measured some monochrome LED's that they only agree with each other to about 1dE or maybe worse.
And the elephant in the room with narrow band light sources is the observer variation - 5 - 20 dE worst case disagreement amongst
"normal" observers is quite plausible, particularly if it's "wide gamut" primaries.