I tend to approach things with a very pen-and-paper mindset.
Your character has, say, 25 points to spend on their skills. Do you max out a few and be amazing at select things and not-great at others? Dabble and pick up a mix of everything, but nothing exceptional?
I think once you get to the point where you're trading weakness for the right to "buy" multiple, advanced skill sets you are also arriving at the point where you have to consider if that actually contributes to your character. If you're looking to balance, you should also be looking at why you are adding extra traits: If the answer is "because I'd be OP without some sort of flaw" what are you actually trying to accomplish?
If you're special enough to be the master of several, widely-varying disciplines (master swordsman who is also a martial artist and a summoner, for example) why is it then too much to have those things without a flaw or consequence?
Your character has, say, 25 points to spend on their skills. Do you max out a few and be amazing at select things and not-great at others? Dabble and pick up a mix of everything, but nothing exceptional?
I think once you get to the point where you're trading weakness for the right to "buy" multiple, advanced skill sets you are also arriving at the point where you have to consider if that actually contributes to your character. If you're looking to balance, you should also be looking at why you are adding extra traits: If the answer is "because I'd be OP without some sort of flaw" what are you actually trying to accomplish?
If you're special enough to be the master of several, widely-varying disciplines (master swordsman who is also a martial artist and a summoner, for example) why is it then too much to have those things without a flaw or consequence?