why is it called the 390x?

It has some of the most stops in the eastern suburbs buses, so why is it an express bus with 'limited stops? ' There used to be a 390, I think, which had even fewer stops.

like if they were going to make an actual 390x it should be roughly

junction- Bronte Rd- Frenchmans Rd- Clara St- UNSW 2, Juniors Kingsford + light rail, pacific sq, Anzac/Murray St, Anzac/lawson, Anzac/Forrest St, Anzac/Jennifer, Anzac Pde terminus.

that's 13 stops instead of 41

let me know your thoughts

redone express bus