In fact, the only good argument for using non-Euclidean traces is in the ultra-high-speed arena (think DDR4 bus or multi-GHz RF). All for effectively no benefit on 99.9% of all PCB designs. You have to operate control points for every single segment rather than just dragging a trace. Ever tried to manipulate font outlines? It's like that on a PCB, only an order of magnitude worse. Curved traces make your GUI ridiculously unmanageable. Aside high frequency busses (which you're doing EM analysis on anyways), traces can be all sorts of shapes. Well, to be fair, the 0/45/90 deg traces are a byproduct from early days of EDA CAD products.
