I agree that it would provide an additional data point, which could be useful. But there’s a real danger of being badly misled by it.
We already know that the two alliances have near identical Titan scores. If one has a higher score for their aggregate raid defence teams’ power, then the most likely (though not sole possible) reason for the match is that their benches are markedly weaker than their opponents’.
We can’t measure this in any way, but it’s an offsetting factor that ought always to be taken into account. And when one thing is measurable and another, arguably more important thing (for wars, anyway) cannot be measured, there’s a tendency to overweight the former and underweight the latter.
Moreover, of course, simply summing raid defence strength fails to account for intra-alliance strength distribution, a far more important factor than alliance aggregate strength, for wars. And we already know that these alliance fare equally well, more or less, where Titans are concerned.
So while more data points are usually good, this particular one has so little relevance to the considerations at hand, and such a high probability of being extremely misleading, that I wouldn’t waste my time with it. Any time it was used it would need to be caveated to death, so there’d not be much point to it.