Even if you put more on the rear you can still get 50% more options if you add a 3rd front cog.
It's not needed on everything but I really appreciate the extra options on my recumbent and touring bike.
Most of those options are overlapping and redundant though. Only the total range really matters, by simplifying the front the whole system becomes easier to use and mechanically less complicated.
Most of those options are overlapping and redundant though. Only the total range really matters, by simplifying the front the whole system becomes easier to use and mechanically less complicated.