Its not the monochromatic aspect of LASER it is the extreme stimulation/amplification of a single or extremely narrow segment of optical bandwidth that a laser uses so that it is relatively easy to block or filter out while leaving the visible section of the spectrum untouched.
Leaving aside (not trivialising it ) the potential damage to the eye from a pilot vision point of view a really powerful conventional light source would be much harder to block but leave FD displays visible