The Concorde also Supercruised for most of it's flight. Yes, it had afterbruning engines, but it did not use afterbruners for it's entire time above Mach 1.
https://en.wikipedia.org/wiki/Supercruise
One of the best known examples of an aircraft capable of supercruise was Concorde. Due to its long service as a commercial airliner, Concorde holds the record for the most time spent in supercruise; more than all other aircraft combined.
Yeah...the ideal is that you wouldn’t have to go to A/B at all but that’s impractical since you don’t want to have excess power just for the transonic drag rise portion (note the Cd(M) plot..), why not just burn through it. It comes down to “how long do we want to do that” and what’s the fuel consumption trade.
So Concorde with the old Olympus blow torches still qualifies as “supercruise” because they had enough power to maintain speed after the A/B shutdown, but only when far enough along the drag rise curve to make that effective.
From both a cycle perspective (and thus aerodynamic design) and operating economics the ultimate goal is to negate the need for an A/B, and the newer engines get pretty close. Some may meet this goal, note that was the case with some of the examples in the link.
So even a hoary old bird like Concorde proves the point...we have what we need to get there, just need the right mix for the market and the regulators (no pun intended).