I have watched that replay and considering TB presence we had equal forces at time of that engagement. The TB strike mainly killed the commander; Dominatrices were enough to finish the rest. Without TB switch i would have had 3 more dominatrices (800 factory, 500 thunderbird would have been 1200 into domi), giving me a less dramatic but still sufficient lead. Additionally, many of the Scorchers were purpose built for that strike; again, a nonexistent TB would have meant even more of the mediocre alternative.
If you think a 150% cost in an optimal anti-shield Rover composition should not have won against your shieldball, then, well. That's not a good argument to nerf TB in isolation, but a good one to shine light on rover vs shield.