That's the first time I have ever heard Morrowind described as an ARPG. I can tick that off my list of "shit I never expected to hear".
There's a fair amount of nonlinearity in Baldur's Gate 1 and 2, Wasteland, Fallout 1 and 2, even super old lesser known games like Quest for Glory 1&2.
Pretty much one of the defining features of (western) crpgs is their branching narrative and open world.
