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Yeah, if:
a) You're a retrogrouch
b) You need to frequently disassemble your bike for easy transport
c) You're super bored and like inconveniencing yourself because your other bike has Di2 and you enjoy blogging about going back to basics to an audience of nobody
d) You're going to go on a tour where the itinerary includes Aleppo, yak herding in Mongolia, and fighting gigganiggas on Mars, places where even the slightest risk of barcons or STI grenading is not acceptable and you absolutely must have the simplest and most reliable method of changing gears that there is.
Otherwise, make like a loli and get STI