Not familiar with FF:Tacticts, sorry not really into jRPGs, they are boring.
XCOM is not an RPG at all, yes the newer titles do have some RPG elements, but the principle of combat is entirely different. And btw XCOM:Apoc had insanely OPed gas grenades early on in the game, so you're wrong, there was CC.
Ogre Battles - what is that anyway, some indi trash? Sorry for being harsh here, but haven't ever heard of it, not speaking of playing, so don't even see a point in googling what that is.
Oh, and the point of elemental combos is to do _FREAKING_ crowd control, which _IS_ CC! Even blowing the heck a gas with fire is crowd control. So you are providing a point you on your own are controversing. Google the definition of "crowd" and "control" for starters.
Yeah, electrified water and ice were an easy cheesy combo, however you wouldn't be able to win more then a half battles on Tactician in OS1, without using them. That's the whole point of the game, holy crap, and you're complaining about it.
Oh lord. You're doing a great job at discrediting yourself here. Firstly, I was referring to the Firaxis XCOMs (the well known and well received ones in general), which are Xccom EU/EW and XCOM 2; those are considered RPGs.
Secondly, you're an idiot if you think JRPGs are boring. Games are games, some are good and some are bad. FF Tactics is basically Game of Thrones with some pretty kickass combat.
And lol, indy trash. How edgy are you trying to be?
And FINALLY, no, elemental combos are not for CC; one of the most common ones was oil/fire/poison, which is just pure damage and a slow effect (which is soft cc). Smoke from fire+water obscures the targets within. Cursed surfaces inflict disease I believe, and I think there are blessed surfaces as well. I think you're confusing AOE with CC. Stuns and disables are CC; at least, that's generally how they're referred to on this board, and there are a lot of topics on it both here and on steam sooo...
Fire+oil/poison is an aoe attack. It doesn't prevent the enemy from taking action.
Only electricity/water combos and effects create hard CC. The problem is that they're easy to exploit and there are a lot of other non combo abilities that are stuns; petrify, knockdown, shock, frozen; these all work the same and can be chained and spammed together for nonstop lockdown.