There’s also the multi-scale argument in favour of higher posts. They’ll still look quite sizeable in 28mm, and with the stone “bricks” being as large as they are, there’s nothing else to make these pieces appear out-of-scale in 28mm. Obviously the walls themselves will only be about chest-high in that scale, but there’s still plenty of uses for chest-high walls.
The regularity of the stonework is a plus. When I’ve bought irregular-stonework resin walls from other manufacturers in the past, I’ve been disappointed to find they’re all just duplicates of the same sculpt, which looks bad on the tabletop. With your walls, duplication of the pattern should (hopefully) not be a problem.