I agree, it's another hole. Most countries found something else to fill those roles and apply similar tactics without using horses or helicopters for WWII, at the least. I think some sort of motorcycle/ armored car/ jeep unit to fill the scouting, screening, disrupting communications, pursuit and flanking roles of light cavalry ( you know, the ones promoted along the flanking/visibillity route ). I figure heavy cavalry ( combat promotions ) went the truck infantry & half-track route on the way to transport helicopters and Armored Personnel Carriers. That being said, I have no problem with unit types going obsolete. Sailing ships upgrading to ironclads and dead-ending. Cavalry dead-ending.