Having spent so long playing Comrades, going back to FFXV makes it really clear how much they used it to open up the capabilities of the combat system. At this point I'm about 100 hours into Comrades and have a bit over 200 in XV.
One of the biggest tells for me was the difference between fighting Omega in XV vs. fighting Ifrit & Bahamut in Comrades. Part of it is the co-op and teamwork aspect, but I think the overall format of Comrades really nailed down what makes something satisfying.
In FFXV, there's no reason to get a game over unless you're ABSURDLY outmatched. On one side, I'm a big fan of that, but on the other end, XV ends up feeling tactically limited because it generally has a one-size-fits-all approach to its combat scenarios. If combat control of the Chocobros had been implemented earlier, I'd expect we'd see a lot more scenarios that involved some enemies being built more towards taking advantage of different tactics and abilities. Instead the "Hard" boss fights typically end up feeling more like a long slog through item management than a real challenge. (That being said, it'll be interesting to see if anyone does Noctis Glass Cannon runs of XV using the item gained from that battle)
Comrades really embraces elemental and weapon weaknesses, and learning to counter and exploit blocking and enemy vulnerability states along with really solid MP management. The food items as a limited supply Phoenix Down is also really well done. At higher levels, the Sigils even make things more team oriented with the DPS heavy builds tough not having healing and relying on their teammates, or the magic builds being powerful but fragile, draining the MP and limiting their mobility.
While this might JUST sound overly critical, I think that it's really an interesting look at how SE is exploring the overall depth of the whole active combat system that they have. I feel like the way it's opening up variety is still VERY telling of how things are looking for FFVIIR. Materia will change a LOT between how they both work, but I think that they have a really good feel for how to keep a wide variety of things balanced, and also encourage team synergies without requiring a particular approach to scenarios.
tl;dr — Come play Comrades. It's friggin' great.
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