Except people don’t put themselves into that narrow mold. I haven’t been playing for a few weeks, but I checked out my city and confirmed that I didn’t follow the plan you suggest. I reached the endgame with a sub-optimal design, and when I go back to finish off a conversion to something near-optimal (that still won’t be following your pattern,) there will be design tradeoffs that will influence the appearance.
People’s cities on display show that creativity is not being stifled by the demands of achieving productivity bonuses.