.......>Also an egg pricker - this pierces the shell of an egg before you pop it in the pan to boil to save it bursting. <
......My first reaction to this was, "you're kidding, right?" But I see Amazingrace also uses one.
.....Whatever for? I've never heard of, let alone experienced, an egg bursting by being boiled. And certainly have never seen this gadget.
if you poke a hole in the air sack in "the big end of an egg" the pressure build up (due to temperature increase, science thing, no options, it happens....) has a place to go short of busting up the egg.
I 'sorta' agree about the "bursting egg" thing. frankly methinks those eggs that bust open and spew the white (hopefully only the white, but I have indeed seen yolk spewed out of an egg in for a soft boil.....) have already been "cracked" or otherwise subjected to some stress resulting in a "looks right but not obviously cracked egg shell"
if you are heavy duty into conspiracy theories, any "pre-cracked egg shell" fulfills the magic bullet theory of "run for your life - it's a salmonella egg!"
anything can be used to poke a hole - needle, special doohickie, pointy tine of a carving fork, point of a 38 inch chef's knife.... in that respect it is a "most useless" - but per your own thoughts on plastic radish flowering cutters.... it does exactly what it's supposed to do when&how you want it to do that and it is convenient . . .