The thorn off-road tourers are (or can be) supplied with drop handlebars - my nomad is, so there's nowt wrong with the principle. That said, I gather it can be tricky and expensive to swap since you have to change things like brake levers, maybe brakes themselves too, and bar end shifters are a bit pricey too, as the integrated brakes / shifters may not be compatible without some cleverness and bodgery. Also you might not have the right frame size if you change as the ideal length is different.
That said, I've not done it myself, and have only ever bought drop bar bikes