Philosophy Versus Science

[Sheldon]

either pursuit would make me less useful in certain ways.

The idea that it is good to be useful is of course a philosophical idea. 

"How should one live?" is among the oldest and most important topics in philosophy, and "one should be useful" is one  way that people have answered that question. Valuing usefulness over other things is a position that has a long history and genealogy. Some people have disagreed, of course, but I would never argue against it.

(AFTER a person has made a value choice -- e.g. "it would be good for me to cure diseases" -- then the methods one uses may well be informed by science. But the value choice itself is not a scientific choice.)

So a method designed to objectively examine reality is no good at evaluating purely subjective choices, but then nor do such choices require evidence of any kind, so we're back to where you assented a poster was ignoring "evidence" unless it was scientific, yet no example of such evidence has been offered, only subjective claims which of course are not evidence, nor do they require any.