It has been for a long time. Mao Asada was the first Junior Lady to do a 3A+2Lo in the short program
And it was weird then like it is now I think; that you are allowed to do a 3A combination and then have to do the required 2A.
This was always true in the men's SP for as long as the solo axel was required to be double (1973 through 1998).
If the combination requires or allows a triple jump, then triple axel meets that requirement.
We first started seeing men's short programs with triple axel in combination with the then-required double toe or double loop, and solo double axel, in the mid-1980s.
Since 1989 season there has been no required double jump in the short program jump combination and triple-triple combos were allowed for men (for women as of 1997 season).
Ca. 1989-90, there was also no restriction on repeating the same jump in different jump passes. So some of the top male jumpers did 3A+3T, solo 3A as the jump preceded by steps (without much in the way of preceding steps), and the required 2A. (And at least one skater did 3Lz+2T, solo 3Lz, and double axel.) Then the ISU closed that loophole so that the solo non-double-axel jump could not be the same as either jump in the combination.
For most the 1990s 3A in combination and solo 2A was state of the art in men's SPs, until they allowed solo quad as the jump out of steps and/or 3A as the required axel beginning with the 1999 season.
From the mid-1970s until the mid-1990s, women were allowed (but not required) one triple in the SP, as one of the jumps in the combination. In fall of 1991 both Tonya Harding and Midori Ito included 3A+2T as their combinations, along with the required 2A and their choice of double jump (as then required) out of steps -- 2Lz or 2F as they preferred.
And, yes, Mao Asada also included 3A combination and solo 2A as a junior. I don't recall offhand if she ever went that route in seniors.
So 3A combination and required 2A has a long history in the sport for short programs in events where the rules at the time required solo 2A and required or allowed at least one triple in the combination.