Hi all. The speeds are a feature of the Referee's Manual Design evaluation. Even after modifying the design evaluation process to only use the power left over from other components, at the higher techs for these designs, you get massive speed bonuses. Because most of the robots are small and light, the power-to-weight ratio is usually very good to start with, even with fuel cells where you've already used all but a few kilowatts of power.
So, yeah, robots at TL 12 or so with contact based suspensions are waaaay over powered for their purpose, but believe it or not, it's actually an existing quirk in the craft design system.
When considering the impact on the in-game universe, I visualise robots as having the capability for frightening bursts of speed, as a result of almost magical hi-tech transmissions and suspensions (consider that in-game, we are living at around TL8, maybe TL9 for computers), and our world would look like magic to someone who fast forwarded from the 1960's (around TL6). So now fast forward another 3-5 TL's - what does our society look like?
I'll finish on this note: what Traveller provides in this regard is a framework for imagining a future society in a lot of detail. That's what makes the design sequence fun for me, and I suspect, a lot of my fellow Travellers.