Most major brand toures use integrated brifter style. It is only some more exp-worthy bikes or boutique companies who offer bar-ends. DTs are only found on entry-level bikes or older ones.
The advantages are mainly about the friction mode where you can make use of any available parts without worrying about compatibility. On tour, your replacement derailleur is likely to be a steel Shimano SIS model, quite usable but possibly not with 8/9 speed shifters.
Bar ends and DT can be stripped and cleaned easily. The main source of trouble is if you immerse a brifter in muddy water.
I use brifter on my tourer but carry a rear suntour lever that fixes to the DT boss. Many modern frames lack even the boss and use a cable guide brazed directly to the frame.
I find that DT shifter are very quick and direct. The extra cabling of bar ends makes them a bit vague in comparison but at least you can keep hold of the bars on a descent.