From my own personal experiences (total of 12 wipes on two attempts...), I can say it's mainly down to the situational awareness of the people. Yes, the purple shit can make it hard to see the safe zones but when people just stand there and get hit by beam then complain, it's their fault entirely. Once I found where the safe zones were, it was simple to survive the phase. What was not so simple is trying to tell people to follow the marked person to survive and they just don't do it...
This being said, the eye sore damage could be reduced slightly (not drastically but ever so slightly) and maybe slow the beam down slightly as well.
So many times that the beam has nearly caught up with us before the maze opened up the next safe zone.
The fight is tough but not on the grounds of mechanical difficulty; it lies solely with social aspect of LFR when people just completely ignore any and all instruction given to them.