There may be a larger pool of templates now, but they're not actually the land you're initiating the battle on (or being attacked on). It's a cheap alternative, and a big step backwards. It was a major selling point for the early total war games, they were more grown up, having features even older military folk in my family thought were real deal simulation level features. And I have fought on the same repeating map during my miserable time with Rome2. I fought on the same tile all the way from one coastal city in Iberia to the central one in one hilly area -- 5+ battles throughout those hills in different "zones" but always the same map -- just from different sides or points of entry. Backwards.
I've taken up in the high hills around a town after outmaneuvering a superior army, only to find totally different flat terrain once the AI engaged me (where I plotted and cleverly got them to). Advantage gone. Strategy out the window.
I've set up in the woods through a narrow valley in northern Italy to ambush reinforcements pouring into the area, only to find a barren, sandy open terrain where I couldn't hide any troops once the battle was initiated. Pointless campaign positioning.
This goes on and on, making any strategic level to the game completely moot especially when you factor in that the AI can just take flight on the open sea and avoid any difficult land routes whenever, and wherever it wants. Total farce.
That was only my PS. There's still no real battle simulation going on in these engines. There aren't even real secondary weapons, you know that by now of course. It's all a big cosmetic lie.
The best thing to say about it, is that it's a marketing video, that you can play. Has about as much depth as a 3 minute video too.