Siranui: The Tac also has better melee ability, much cheaper stat advances, and solid leadership abilities - not every team will have an Ultramarine. When you've got a Storm Warden Tac giving the entire team a free round of surprise against every major enemy, you'll learn to appreciate how much deadlier a Tac can make the KT.
Again, DW is only mostly about shooting combat if you make it so. I can't address that for other players/GMs, but there's probably an even mix overall in my game. Some missions feature more melee, others more firefights, but in total they're pretty close.
Sure, the Apothecary is "defaulting," but when he gets to add +10 for Range and +20/+30 for Size, he still can hit easily. An 80-90% chance of hitting with a Lascannon will hurt no matter who you are.
He often doesn't carry the HB, so it would be more like this (using the old weapon stats here since I haven't used the new ones yet):
Apothecary sees a Horde. Quick Drawing his bolter (with Metal Storm rounds) he fires four shots. Base BS 50 + 20 (full auto) + 20-30 (Size) + another possible 10 or more from Range or other sources = average target number of 90-100. An average roll means all four shots hit x 2 (MS rounds) + 1 = 9 Mag loss, less than a Dev but not horribly so now (this was the big drawback under the old UD). And, he can quickly switch between firing MS rounds at the Horde and Kraken rounds at the Genestealer trying to flank. SoI now is where the big difference will come in, but that's not an early ability that the Dev will quickly pick up.
If you use the new stats, it'll make a huge difference, of course. If anything, the HB is now much more powerful compared to the other Bolt weapons than it was before. That's good and bad: it helps the Dev stand above at range but really hurts the firepower of the other members. Then again, everyone was complaining that the other heavies should be better and more appealing than the HB, so it's not like the HB will always be picked for the mission, anyway.
Stormast: It wasn't the Dev's abilities doing that, it was the awesome HB (and crazy Righteous Fury rules).
I hope you're right (and now I'm tempted to add a dancing Lictor to one of my scenarios
). So far, it hasn't really been a problem for me. The only Hive Tyrant that completely approached the KT in the open (when I ran Extraction) first sent in a bunch of minions to keep them busy and then approached using a swarm of Shrikes to provide cover while it unleashed psychic abilities. The Dev killed a lot of Shrikes but the HT lasted long enough that the team came out of that last fight limping.