I think this is just a situation of "if it's not broke..."
I mean, unless someone can give battle reports to show something truly egregious.
The closest I've seen is attackers relying heavily on R5 troops, against cities which lack any, allowing the attackers to win from out of reach. But I've never seen such battle reports, and I've only sparsely heard of it. And... I mean, honestly, sounds fairly legit. "attack the fortified location from out of range" seems like pretty basic siege tactics.
It's the tactic OT and co developed on the Colonies to deal with MT after a couple of years of our R4 SF basically slaughtering anything fielded against us. The battle reports were very dull with two or there successive turns of stalemate battles being common. I'd love to know how much they had to invest to get those R5 RCs
