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I can see the functional advantage if the bcd is large enough and tooth count small enough that the chainring nut would be in the way.
It reduces the number of small parts i.e. 1 bolt instead of male and female.
Some chainrings also comes with a shoulder/lip in place of the female bolt to assit the ring sitting in middle.
Also, some Shimano crankset are now threaded on the crank, nothing new since granny rings are mounted this way.
coventry_eagle
Does it though? I can see the functional advantage if the bcd is large enough and tooth count small enough that the chainring nut would be in the way. Otherwise it seems like it takes a thread that’s normally, or at least very often, in steel and replaceable and makes it both non replaceable and from a weaker material.