I think your analyses of UA vs Tactical support is off. UA is a complete doc with viable tools that support eachother throughout, especially in urban environments. UA works in every map size Tactical Support doesnt have that quality of commander design. Its just an inferiorly designed doctrine. We see Calliopes are highly rated by TS in 4th most popular 4v4 even with poor design. Tactical Support needs a clarification of what it does, which is a weird jumble right now.
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I have a different opinion:
Tactical support is a well designed commander that follows the Infantry commander design. Both have LMG, both have a light vehicle (MHT/M5), both have an off map, while infatry get mines and Tactical get recon.
On the other hand Urban defense gets much more, no tech grenades, superior mediums and less micro (can keep AP round and fire WP against soft targets), superior infatry in Rangers, one of the best smoke in game with cover to cover, plus the Calliope. The commander is simply overloaded and above other commanders and those show in picks.
In numbers UA score consistently above TS in all modes being first or second pick.