Yeah, makes sense. The game isn't quite as complicated as it may sound, it isn't as simple as the games you mentioned of course but it isn't terribly complex. Each part of the battle system is introduced individually, so it's fairly easy to understand how it all comes together. And you can read the tutorials from the menu, so you can look something up if you need a refresher. As far as stats go, there isn't much to manage, just slap on some new equipment when you get it, leveling up is more important. Gems can be confusing, but you don't have to bother with these to get through the main game.
Battles move pretty quickly too, however the story does feel like a drag in parts so you may get impatient with the sometimes slow story. This would be the stickler if there was one, the main story probably takes about 60 hours if you don't do any sidequests, of which there are hundreds. You don't have to do any of the side stuff, although the items and experience you get from them can help you get through the story. The game does give you a reminder of where you're supposed to go, and has a log of all your sidequests and what you need for them, so it is easier to get back into than RPGs usually are. But it's still better if you have time to invest.
I wonder if you might actually want to check out The Last Story instead, that one's a 25-hour adventure. It isn't up to Xenoblade's quality, but it's still a good game and worth playing.