It would make reading, as possibly speaking, have much more flow imo
What you're talking about is called boustrophedon and was indeed used in certain ancient languages. In Greek, there are ancient inscriptions that work like this, but its popularity as a writing style dies out by the Hellenistic period. For a resource on this with respect to Greek, check out A.G. Woodhead's The Study of Greek Inscriptions, ch. 3.