I mean, it sounds like a tool they occasionally find useful and don't use otherwise. I'm not sure how "occasionally use a tool good enough for my purposes" is a waste. Whether it's the most efficient application of that electricity is a different question, but without knowing their particular scenarios I can't really compare whether other tools use less electricity for the same purpose.
(Yes, of course, "just do it all in your brain" is even more efficient, but if that's an argument against utilities, you probably shouldn't waste electricity on Lemmy either)