My understanding is that the reason for this application is not so much the firing time, which other militaries are perfectly capable of (I think the article is

My understanding is that the reason for this application is not so much the firing time, which other militaries are perfectly capable of (I think the article is somewhat misleading in this respect), but so that the Ukrainians can disperse artillery guns, rather than keeping a battery at a single location, which in 2014 got much of their artillery destroyed.