Maybe you like getting into minutiae of game systems, but I mostly find it annoying. I hate filling my inventory with trash loot and then having to sell it. I hate having to min/max with stats and talents. I would really hate having to re-do my ability bars and tactics for the whole party every time I go into a different area or start fighting a different type of enemy.
I want a good story, attractive graphics, engaging characters, and exciting combat. I don't want to take a few minutes to do my taxes before moving on to the next bit of the game. If that's what this new system calls for, I might just dial the difficulty down and spam the awesome button instead of bothering with it.
How about an option to not actively control a party member during combat? Let all 4 of them run on the tactics set up for them, so that I don't even have to spam the awesome button. Combat auto-pilot. There always seem to be a few ADHD types who want to "spacebar" past conversations and story bits to get to the combat and loot... how about letting me "spacebar" past the combat and loot to get to the story and exploration bits?
Yes, I'm exaggerating. Hopefully my hyperbole illustrates how elements that some might find "tactical" and "challenging" might be annoying and tedious to others. Combat in games is at its most exciting (and heroic) when something nasty and unforeseen jumps out at you, and you have to react to it "on the fly." When you're planning everything out ahead of time, it necessarily becomes a lot more predictable and starts to look a lot more like work.
AlanC9 made the observation "it's a game, not a simulator." I would counter with "it's a game, not TurboTax."
What makes you think at all that is what it will be like? Far more likely is well for a good while you'll have less than eight abilities then you'll have nine you'll have a core set and one you switch in when an area requires you to mix it up. Eventually you might reach say double that eight, of which some of them will be 'Core' abilities you use in almost every single situation so they never change. Then there will be abilities that sync really well with other companions so you always take them when that companion is in the party. Then there will be abilities that are useful in certain areas less so in others, those will get switched depending on where you go. I fully expect that by the time there is enough abilities that you need worry about switching them, the player has a pretty damned good idea of what works best when and will be used to switching it around on the fly.
I'll make a deal through if it does turn into Turbotax or whatever, I'll post my full and abject apology for doubting you. If it doesn't will you make a post apologising for doubting the devs? When you can use everything, then you need make no choices, your not adapting to the unforseen you forsaw everything in advance, adapting, true adapting is when you don't have the exact resources needed to win, and you pull it off anyway.
What your talking about is not the same, having the option to use everything means having everything prepared in advance, at worst all you did wrong then was not leave it on your quick slots so instead you use your radial.
I bet through that the two most satisfying wins will be where you worked out in advance the perfect combo of abilities that synced well with the rest of your party and blast a boss into dust, and those ones where you made a mistake, and your abilities where far from perfect, and yet somehow you pulled off the win anyway, through a combination of luck, skill and maybe just maybe a liberal use of healing potions.