How would that break the game? That would be just like how the spell combos in DAO worked, amd something I actually requested on its own just to avoid the arbitrary cross-class requirement.
The DA:O spell combinations were not nearly as powerful as CCC's, except maybe Shattering, and for the most part they were more than simple spike damage attacks. If you need proof that this breaks DA2, you can modify a DA2 mage with a save editor to test this for yourself. The ability for a single character to stagger multiple enemies and then immediately use chain lightning on them is completely overpowered. Now maybe that's just a matter of what side-effects "stagger" has or how much damage the combo itself causes, but the combo system would need some serious revisions for this to be balanced...
Since the player can control multiple characters at once anyway, what's the harm in concentrating those abilities in a single character?
The fact that a single character now has the ability to stagger and then kill multiple enemies within seconds, without the aid of allies, ruins party dynamics and marginalizes the followers. This isn't even an advanced combo... it's something you can access after only a few levels. If every character is able to take advantage of these "single class combos," then you might as well just save some time and drop the difficulty level as low as it will go.
Obviously you'd design the game's mechanics around it, just as they're currently designed around its absence.
This is true. It's also the reason I said, "the balancing process for attributes, armor types, weapon skills, and spells would need to be very in depth."
Keep in mind, I am not disagreeing to a classless system outright, I am merely in favor of a custom class option rather than allowing full access to every ability from start to finish. Along those lines, spells, skills, armor, weapons, and even attributes need to be designed so that the custom class can't just grab a few low level abilities that happen to mesh well and dominate for the entire game.
But the combo system isn't, in and of itself, a problem.
It would need to be completely revamped, or most likely scrapped, in order to be used in a fully classless system... A combo system might be feasible, but not the one we currently have.
No, you could solve this by having longer talent trees (though tying Stamina to Constitution would also work).
I think you may have misinterpreted my objection. Spells and weapon skill both drawing from a single power source completely violates established lore (what each attribute does can be considered part of the lore... they represent the physiology of this planet's inhabitants). A mage who was also skilled in two handed weapons would need a mana and stamina bar, they couldn't, for example, expend mana to use Scythe.
If a DAO Warrior wanted to learn 2H talents and S&B talents and Archery talents, he couldn't max out all if them. I had a Dwarf Noble who was primarily a dagger&shield fighter, but he also learned Pommel Strike in order to have an extra ability he could use to break up Overwhelm, and since he inly swapped to 2H just for that, it was never on cooldown. But, as a result he had one fewer Shield talent than he otherwise would have at every stage of the game.
I don't have a problem with this as long as you don't attempt to add spells or dual weapon talents to this character. IMO a character's starting class is a reflection of their training, and thus should not be so flexible that they can easily learn to use previously untouched weapons. This limitation needs to be in place because it takes time to master the use of weapons, and I don't see how it would be possible to become proficient in all weapon styles over the course of a single game.
but that is not quite the same as arbitrary total restriction or game system that for all intend makes a concept so unpractical that it is equivalent to a restriction.
It is perfectly fine that the rogue class has a special way of using dagger that can't be matched by any other class however it completely sucks not be able to use a dagger if you do are not a rogue or have enough in the directing attribute to make it viable.
the point i am getting at is that most of the people who wants a two weapons warrior are not after the DPS of dual wielding with the lasting power of a tank. They are after character concepts.
It is not that complicated to come up with a system that preserves the class "uniqueness/superiority" and yes gives other class a viable/usable alternative flavor.
I am opposed to a classless system, not a custom class option. Unless careful considerations are made, and some kind of limits put in place from the start, it might become too easy to make OP characters as the game progresses. It can't be a total free for all, and IMO it can't be something that gets changed halfway through the game when you decide you want to start incorporating crossbows...