I think one of the best things about the new scoring system is that there is clearly no good way to maximize all the bonuses at the same time. This means there will be trade offs with every potential team. This means more experimentation and variety as we try to find a team that scores consistently well with our play style. This also means several different play styles can be successful. This is fun.
If the formula worked as you suggest, then we will quickly find a single optimal mono-color team for each day that maximizes one bonus. This is very similar to what we had before when guild wars felt a little like a grind of playing the same battles over and over again.
I tink the way Sirrian has laid it out will encourage much more variety and creativity on both offense and defense.