So I decided to have the bots scrim each other.
Local server. Two teams of bots, 3 members each, confined to the outside area of Ingar's ATCS HD.
The alien base:

The human base:

The human bots had a distinct advantage. They had auto-aim, and thus completely ignored the dodging inherent to the alien team. Thus, the human bots were the first to gain heavy weapons.

As you can see, naked humans with lucifer cannons. And they were winning.

Happy mara.

About 20 minutes in, I turned gravity off.

Tyrant is happy because he is no longer constrained by his enormous bulk.

Poor tyrant. Those humans took him down.

Conclusion: bot vs bot scrims are completely hilarious and should be tried by everyone. If you've already downloaded the Brindus mod, you have them available. Just switch to the Brindus mod via the main Trem screen, type /devmap whatever, and set sv_privateclients to the number of bots you want. Build their bases, add the bots, watch them go.
Thanks go to Ingar (for ATCS HD) and Celestial_Rage for the bots.