It's one thing to suggest replacing original quality fuses with cheap glass fuses from the hardware store. They'll still save the meter for the kind of overloads that most users actually encounter, even if you lose the high-voltage rating on the current scales. I'd call this not-recommended, but acceptable for typical users that never run into high voltage.
Irresponsible is suggesting that someone who is clearly still figuring out what current is, never mind how to measure it, is qualified to make a "suitable" DIY fusing wire selection, proably limiting themselves to the few too-large choices on hand. Odds are they'd end up with something that will make the meter a weaker link than the wire, although it would work until that event.