Gestalt characters create much more room for optimization and synergy between abilities. This makes gestalt characters vary in power much more than normal characters. There isn't only a handful easily breakable combinations; there are many. While this variant reduces the power of gestalt...
I agree. I've always thought taking 10 (though not necessarily taking 20) was kind of a silly concept.
Runestar, if your Warblade always makes saves due to taking 10 on Concentration checks, you're obviously aren't throwing enough save-based abilities at him :P