In addition, since the whole plot revolves around a group of people attempting to control a mark, creating (relatively) mundane situations for Fischer was probably critical to maintaining that control. Wild and beautiful dreams would be difficult for the outsiders to maintain and explain and Fischer would realize he was dreaming (because it wasn’t his dream), which is why they hired an Architect in the first place. I thought they dealt with that explanation well.
I was hoping we’d see a second training scene with Ariadne that would have given us more of a taste of the dream-bizarre that we’ve all experienced.
Another movie in that universe exploring other uses of that dream-sharing technology could be fascinating. I’ve always been curious about that group of dreamers the Chemist revealed in that basement room.