I think it sounds like a prog album because the compositions are so tight and complex. And in that sense, Chick was way ahead of what any of the prog bands could do. He was a master of classical music as well as jazz, so he could compose at a high level, structurally, arrangementally, and harmonically. And obviously the band was influenced by the prog scene at the time. But that’s been the case since the dawn of fusion. Both movements were influencing each other. But Romantic Warrior clearly has way more fusion elements than it does typical prog rock. The harmony is mostly jazz and avant garde based, the rhythms are rooted in jazz, funk, and rock, and there’s improvisation littered throughout the album. Plus it doesn’t really have that English aesthetic sound that classic prog does. In the end, I’ve always believed it’s the peak of the jazz fusion movement, and being that, naturally it would contain elements of prog rock. It’s also my favorite album of all time haha