It's more to make things look neat really it doesn't make much difference in practice, if you look on most standard cars you'll see they aren't exact equal lengths, and on some motorbikes the front brake line from the brake cylinder goes to one caliper on the front wheel and then off to the other one.

I don't run a servo in my cossie and it works fine, you have to press the pedal a bit harder compared to a servo assisted car but nothing to write home about, this will depend on your setup though i.e. brake pedal ratio and master cylinder sizes.