And just that you contradict yourself: one Katyusha has a dense rocket volley only at a dangerously close distance. If you want a dense rocket salvo at a distance - you need two Katyushas, one jaeger unit that appeared in the rear can destroy two Katushas, which can cost you victory in game. So no, Katyusha is the most balanced artelian unit in the game.
Yes it is somewhat balanced but in a way as snipers are balanced. Some factions have better tools to deal with snipers, others suffer (I'm looking at you, USF). Same with Katy.
Apparently the OP arty is panzerwerfer and walking stuka. Guaranteed squad wipe in close range.
They are much more dodgeable than min-range Katy barrage.
Ah, yes, I see now, I didn't mentioned one important trait of Katy in my previous post.
Katy is the only rocket artillery piece that is effective against MOVING targets because time between issued order and the moment when first rocket hits ground is really low in comparison Peewerfer and Wurfrahmen.