There is a significant group of commuters who can use these as or more easily than automobiles. AND we determine these scientific facts, then we can draw evaluative conclusions. But since the value premises themselves aren't produced by scientific means, evaluation isn't a purely scientific process. This is not arbitrary or alien to science, and since we often get the value premises in evaluations from definitions, e.g., the definition of a good watch or a good reading program, we can avoid the idea that evaluations MUST involve premises that are from 'somewhere else'. They can be entirely objective, depending only on lexicography and scientific investigation.
Some values come from ethics.
Therefore ethics, properly constructed, is a valid and scientifically based standard against which to evaluate. Nietsche said that ethics is for the weak. That's true, for an ominpotent dictator doesn't need it, but the problem is that everyone is weak. All real dictators can be assassinated, and many or most of them have been. Because if it ever got out that that was acceptable practice, they'd lose half their clients.