cool story, bro.
Not worth it in what sense?
You're asking about Alfine 8 - which is "mid range" - but really, we're talking about IGH in general, so let's begin...
The discs are not the issue. Alfine hubs are centerlock, so not running discs won't look odd at all.
The rear hubs are spaced for 135mm, although you can move around some washers to get them to 130mm, but it is not ideal, your chainline will be off. You will also need a chain tensioner, which is why horizontal dropouts are ideal - but on a Madone, there ain't no horizontal drop outs, so you'll be running a chain tensioner, which eliminates your "clean look," bro
. Unless you run the "perfect chain length", but that's not going to be helpful when your chain stretches or when, inevitably, you need to remove the rear wheel.... speaking of which...
Also consider that changing a flat is a p.i.t.a - not nearly as easy or quick as a traditional hub with quick release. The hub is bolt on... heavy as sh*t.
Gearing: the hub (8spd) will end up weighing essentially the same as a full (average) 20spd set up, only you'll have dramatically less gearing options to your liking. On an alfine-11spd, for example, 2:1 ratio is the best you'll ever get. The gearing is less than ideal.
If anyone ever tells you that internal hubs are reliable, it's utter b*llshit. Go talk to any mechanic in a shop, chances are they'll tell you how much of a pain it is to work on, how often they go awry, and how often they breakdown. The ultra expensive Rohloff hubs? Better but not by enough to make their exorbitant costs worth it for most people who live with realistic budgets.
IGH hubs are inefficient compared to EVERYTHING. Heck, even microshift is more efficient. It isn't the gear mechs that is being referenced for "inefficiency" it is the actual interaction of chain to cog. You lose significant amounts of power with an IGH compared to a traditional set up. Period. They are not efficient in the very basic sense of what mechanical efficiency is on a bike. The differences between different group levels (example, Tiagra up through Dura-Ace) is not efficiency at all: they can each work perfectly fine and just as well as the others. The difference is quality, weight, looks, and employment of materials. When properly adjusted, they're just fine and mechanically efficient. The IGH method is not mechanically efficient.
There's your "cool story bro."
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