TBH, I don't know what else Vult could say. He is making well-reasoned and respectful counterpoints, only to be received with "hurr-durr that isn't the point".
Even after playing the map a bunch of times, I didn't even realize that Ramjet rifles were removed until I read about it in here - and I don't miss them. I remember this map in rotation during my UNRULES era, and yeah, it was a major Ramjet fest, to the point that the new vehicles were useless. I usually spent my time camping with an APC or a Light Tank. Shai definitely had to remove them, for the sake of balance and toleration. Now, each side has their traditional pros and cons.
And there are very big differences between ditch camping and hill camping (to me, at least). Trying to disrupt a hill camp on Hourglass is much harder for two reasons; lack of space for mobility, and the hindrance of base defenses. The Obelisk and AGT can easily help to hold off an attempt to overcome hill campers on Hourglass. But, in Niagara, there is a ton of open space, with no real threat from defenses to disrupt a take down of Artillery or MRLS'. And the open space really makes a difference here. Not only is there a ton of maneuverability room for Humvees, and Recons... but it benefits other vehicles, too. APC's and Lights can also effectively push back the siege tanks, too.
Deadeyes and Black Hands are also still effective, and even more so than on Hourglass (IMO) because of the open space and the large tunnels/caves on either side of the valley, too. Not to mention Gunners or Raveshaw/Sidney - they can also make use of the tunnels to hold off tanks.