You have a valid point with healers going to be doing the healing regardless, but I have literally died from nothing more than tremor damage - from full hp which I think I'm around 3970 at this point. Granted, that was *probably* because one of the healers was 10,000 miles away and not hitting me with their aoe spam... but better safe than sorry and 10% less damage would have saved me there.

FoW in P5, I agree it's not required or needed, but it adds leeway - and while I have not mathed it out there is and always will be a genuine argument for movement speed increasing dps on heavy movement fights. The quicker you get back to a boss, the sooner you're doing damage again - the more damage you deal in total. Whether or not that outweighs 5%... hard to say, but if you ever miss keeping GL3 up by just a second or so I'd say probably worth it.