They went for the serious serial plot but with few episodes so it was only dour and everything had to be constantly on fire

It had its moments

But what if the borg were also sexy?

Ds9 would be completely insignificant that far in the future

Efficiency drops significantly as you go faster than 50mph, so they would be more practical for city cars that don’t do a lot of time on the highway.

Why? Because basic engineering will tell you that small areas of low quality waste heat isn’t something you turn into usable energy.