There are huge commercial pressures to upgrade and buy the best, most expensive, newest, etc. In the past I have gotten caught up in that a little. I almost always regret it and have learned to make do with what I have, ergo the touring on whatever bike I have and making it work.
Yes. But it also makes sense to buy a dedicated loaded touring bike if that is your goal. Why not get a bike designed for your purpose and that is more or less guaranteed to perform that function correctly. Spending money. Buying a new bike. These are not bad, evil actions. They are just actions. Good, bad, indifferent.
If your goal is to tour loaded, sleep in a tent and sleeping bag, cook your own meals, live off the land. Then it makes sense to start with a bike designed to carry panniers and climb mountains. Surly Long Haul Trucker, Trek 520, REI Novara Randonnee, Co-Motion Americano, and a half dozen others are all loaded touring bikes. Loaded touring on these bikes is almost guaranteed to be successful. They were built specifically for loaded touring. It makes lots of sense to buy one of these bikes if you want to do loaded touring. You may or may not be able to make other bikes work. But these are all pretty much guaranteed to work perfectly. Nothing wrong with that.