My bike is like this. It would be cleaner to run those cables all the way along the bars under the tape and have them come out alongside the brake cables. What's the problem with doing it like that? Too many curves in the cable makes too much cable drag?
At some point I'll re-cable everything - what would be the downside of running the shifter cables all the way to the middle of the bars under the tape to where STI shifter cables emerge?
(FWIW the way the cables come out as it is now, dealing with those cables when riding is a minor issue. But it's still an issue - there are times when you must open your hand to move it from here to there on the handlebars. Possibly the bigger issue to me is handling the bike when not riding, locking it up, etc.)