I do some touring with friends that use the bike packing kit and it is a huge compromise that they openly admit to. Yes, they get to use a road bike, but..... It is a faff to get the bare minimum into the packs each day. The packs tend to come loose and swing around or droop onto the rear tyre and usually need at least one stop to tighten each day, often more. The bikes have skinny road tyres so as soon as we hit any less than perfect roads or bike trails that often feature in a typical tour route, they are struggling with the surfaces and risking punctures. We did the Coast and Castles route just last weekend.
On the other hand, my commute/tour/road bike has 32mm tyres and rear panniers. They don't like to admit it but they love the fact I have easy load space for all the team tools, some of their kit, bike locks and even carry proper shirt & trousers for the evenings (we always stop in pubs/hotels each night, all very civilised).
Horses for courses. Don't tour on an aero race bike unless you want to struggle. My road bike is a proper road bike and rides like a pedigree, but is also happy loaded up with all the extra schizzle that comes with a week+ of touring when needed.
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Kona Wheelhouse 2018