Have you flown Scoot? Compared to Jetstar, JQ are a premium carrier.
Both Scoot's YC and JC products are an embarrassment...
I take it you have flown both Y and J on Scoot. Definitely LCC, but they are hardly an embarrassment.
While I agree about the J class on Scoot is less than you would find on JetStar or Air Asia X (more like premium economy on QF), I will take the Scoot Y Class seating arrangement (seat pitch of 31-33 inches) over the cattle car herding you get in Economy at JetStar. From their Website:
"Economy Seat Pitch
28 inches on A320 aircraft, 29 inches on A321 aircraft and 31 inches on A330 aircraft"
Been on both and if you are over 5ft 10in JetStar is just plain painful.