Just as an historical aside, I seem to recall the Mayday fuel phraseology was introduced after the Avianca 502 crash in New York.
https://en.m.wikipedia.org/wiki/Avianca_Flight_052
It was an effort to tighten up communications between crew and ATC especially if one or both are not native English speakers. Despite the gnashing of teeth by the Mayday purists, I guess it’s working as intended.
I’ve also noticed, that unless clearly specified, chaps who have spent a lot of time sitting in ejection seats seem to have a different understanding of what minimum fuel means. 🤣