Not an accurate statement. Probably a badly inform one.
I've more than fifty saxophone solo albums - LACY, PARKER (EVAN), BRAXTON, NED ROTHENBERG, JOE GIARDULLO, BRÖTZMANN, LARRY STABBINS, HELMUTt GIES, MICHEL DONEDA, GIANNI GEBBIA, MATS GUSTASSON, DAVE LIEBMAN, JAMES FEI, BRANDON EVANS, SAM RIVERS and so on - and most of them are outstanding.
I've also solo trombone, guitar, bass, trumpet, clarinet, bass clarinet and PIANO albums, all fines in their own way.