Fender’s contoured version basically just shaves off a corner, as I recall. I don’t own anything with it, and I’ve only played a couple briefly and probably never standing with a strap. I recall it helping but not night and day.
Warmoth’s contoured neck joint basically just angles the whole thing, and uses shorter screws on the front treble side than the other thing. I owned a partscaster with this joint for a while - again, not night and day, but perceptibly nicer than standard.
I played Ibanez guitars heavily for a LONG time and still own a couple, though oddly two of them are older square joint guitars, and those two get more playtime than the AANJ ones. I do like the AANJ design, though - it offers really good access, looks great, and feels comfortable under your hand. My two Suhrs use a variation of this same approach, and if I were to have to choose a neck joint on a ‘anything is on the table’ custom build, this would be the strategy I’d go with. I prefer bolt-ons to neck thru/set-neck guitars for whatever reason, and I think this is the most comfortable way of building a neck joint I’ve tried.