The reason is simple: cost and convenience for the manufacturer. This is a drop bar tourer (I love those) with sti shifters, so it is easiest to use road bike components. Road bike sti works best out of the box with 130 mm bcd road cranksets such as this one (minimum ring size 48-38-26, but those smaller rings would be special order because not standard on a road bike). The alternative would be a 110 mm bcd diameter triple crankset (allowing something like 46-36-24) but for these the manufacturer has to shop elsewhere.such as with Sugino.
Even for a road bike for a mere mortal the gearing is actually on the high side, but all those wannabees who think they are racing the Tour de France don't want sensible gearing. It looks like the bike comes with a long arm rear derailleur, so a larger cassette with 34t should be fine, and may be perhaps be exchanged on purchase of the bike. By the time you change the front chainwheels, you could replace them by more sensible rings such as 48-38-26, provided you can lower the front derailleur sufficiently. For now, you could also try to use a 28t ring instead of the 30t. That should probably work ok, and will not cost much. In general, for loaded touring my preference is for the lowest gearing you can get with mtb parts, such as 22 or 24 front and 32 or 34 rear, and work upwards from there to see what the highest gear is that the derailleurs will take. You will need those low gears, and it is far more important to get up that hill/mountain than to be able to pedal on a fast descent.
This changes a bit of course if you travel really ultralight with only something like 10 kg, but even then you would like at least 1:1 gearing which this bike does not have.
Willem