I think the bike is steered with your whole body, not only with the handlebars. And with a saddle as pictured, your body position, specially laterally, won't be as stable as with a conventional saddle. Just my opinion anyway, I've never tried such a saddle, but I'm somewhat retrogr... er, conservative about cycling and I think if 99% of saddles have had that shape for 100+ years there must be a good reason.