You don’t need buttresses for trusses. A regular horizontal masonry wall will hold and transfer horizontal load just fine. Buttresses are for supporting lateral

You don’t need buttresses for trusses. A regular horizontal masonry wall will hold and transfer horizontal load just fine. Buttresses are for supporting lateral loads, created by the arches. Brick walls are bad at resisting lateral walls, which makes them them tip over, hence the buttress. Big wood trusses are more recent invention than arches, and they allowed to do away with buttresses.