I suggest a little experiment.
Try watching TLJ after watching the OT, and you’ll find it works pretty well as a coda to the saga.
I’ve posted previously that if it were up to me, I would have started the ST with TLJ or at the very least a movie that bears a strong resemblance to it.
I’ve thought about this as well. Each ST film seems to work best when they’re each viewed as a self-contained coda to the OT (rather than a trilogy themselves), and TLJ especially best fits this angle.