It's been a while sense I've looked in my fluke manuals, but I seem to recalled they were pretty specific as to the fuse type to use and to not just use any old fuse with the same current rating?
And I bet the specific fuse they suggest is not a standard low cost type.
You're likely thinking of HRC types, where there's a rupture current rating (in the kA range). So long as the current remains below this value, the fuse won't burst open as a safety feature (human injury). Pricey vs. glass fuses, but far cheaper than expensive medical bills or even a funeral that could result without them.
If so... sigh.. that's why you can't have nice things... don't you see a problem with blowing a fuse so soon?
I get your point (reckless & perhaps should put a bit more thought into what he's doing before poking around).
But keep in mind, he's still learning. Cheaper to learn on glass fuses rather than HRC's in such cases, and assuming mains isn't involved, it should be relatively safe for the user as well. Frightened perhaps, but no missing fingers, hands, or eyes at any rate, and the lesson still gets through.
Hell, even the most highly experienced person can have an off day now and again (distracted, in a hurry, ...), and can forget to move the positive probe to the correct jack and blow a fuse.