While it is true blowpipes didn't get as big an upgrade as javelins, they have been upgraded indirectly now that skirmishers march and fire. They have an effective 18" range for double tap, and an effective 24" range for single shot. This has increased from 12" and 18" respectively. By "effective range", I include movement, and assume that you want to get off poisoned shots and not roll for 7+ to hit (trust me, the math says you never want to do that). The formation thing is weird, but that just means skirmishers are now "only" as flexible as fast cav.