The later versions may have moved on, but some components of a circa 2010 FPGA development I rely on used motif and did not work if lesstif was supplied instead. I can't recall the precise reason now. In any case, OpenMotif 2.2.3 made things work so that's what I made available to that application.
It's likely that the current version of the environment no longer has this dependency: most of the components had been migrated away from Motif (to Qt I think), but in 2010 there was still one holdout.
Certainly the relevance of Motif today is extremely limited, but there are some corner cases where it is (sadly) still required.