The irony of advocating against a "separate utility", and then promoting a separate utility...
What I meant to say is that, if one uses a featureful calculator like qalc, then you get unit conversion included without needing two separate utilities. Of course, if you've used a(n obscure) calculator for decades then it may be easier to learn to use a separate unit convertor instead
So, from my viewpoint, qalc is the "separate utility" that I don't need ;-)