Bar end shifters have been a standard for bike touring for many decades. Back in the 70s and 80s when most quality bikes had shifters on the downtube, that meant you had to take one hand off the handlebars to shift. But a loaded touring bike, especially if it is going up steep hills are best ridden with both hands on the handlebars so you have a firm grip on your steering while shifting. I think I got my first set of bar end shifters in the 1980s.

Some people prefer to tour with brifters (brake and shifter combined) instead, but a lot of us use bar end shifters to this day. I built up my derailleur touring bikes with bar end shifters, that is my preference.

That said, it is personal preference, you can change them later if you wish to.

A friend of mine that has done triathalons saw one of my touring bikes, he said he had never seen tri shifters mounted the way I had them. I asked what he was talking about, he said that you are supposd to put triathalon shifters on the aero bars on your race bike. He had no idea that bar end shifters had been around for over a half century before people started using them for time trial and triathalon bikes. He thought they were a fairly recent invention.