Quad are unusual on the 156 probably due to the reason you mention, common on the 147 for the boy racers
as tidier finish with little to cut away.
Note that I have driven both and find the 156 to be better - Feels more planted and useable and obviously that bit quicker with 200mph speedo (only 180 in the 147).
See how long it takes GhostyDog to come back on that