Yup, stops are controlled by the mech, not the shifter.
Bar end shifters are ace. Ultra reliable, light, positive-feeling, with the right mix of indexing and trim. They fall to hand better than you might think, though clearly not as well as STIs, but on a tourer you’re less likely to be overly bothered by being in a particular gear or having to change quickly.
The one thing I don’t like about them is the cable routing – I couldn’t bear to have mine coming out through the tape so routed mine under the tape all the way up the bar. Which just felt wrong for a bit, but isn’t so bad that you couldn’t put up with it.
They’d certainly be (indeed, were) my choice of shifter for a dedicated tourer and I think most would agree, which is why a lot of tourers come with them.