Of course, they aren't finished why would you be able to use them right now?
Thanks for the feedback, but I think you are a bit confused about the effects of Pervitin in EF. But before that, first of all it works like energy drink, whether you like it or not the comparison, although it is obviously worse. It makes your fatigue to go away, giving you a boost of energy and improves your concentration, allowing to work more and harder and in case of the soldiers, to march farther or to fight euforic... and it causes addiction. Thus the effects ingame are right (reload faster, less cooldown, more damage, healing just a little bit over time, less received damage). Not sure about giving debuff at the end though.
You cannot complain Pervitin isn't related to an Assault tree because that's incorrect.
Nothing in CoH is made to be used only for defense or only for assault, because everything is situacional (except for Brits, they are designed to be heavily defensive, mg nests and flaks). Same for the Pakwagen, Ostheer is not made to be a defensive faction but you can use the Pakwagen as you like, but when you assault a position you would put that unit as far as you can from the combat area but you would still deploy it there to tear down other vehicles as a support unit. The Pakwagen due to its nature is effective in defensive role but do not forget that it can be used to support your raids in enemy territory.
Now, certainly the static Goliath doesn't scream "Assault", but there is someone that it does... The Sturmpioneer unit that is enabled to deploy it. These guys are assault pioneers and are just given that new toy. And I'm not sure why it lacks cohesion, because the description of the tree ties everything together just fine.
I think it is less that the tree is absolutely underwhelming and it is more that you would have preferred the last ditch doctrine to be released instead, and there is no problem with that, but there are no plans for Ostheer to have such tree, at least not now. Also, I don't think adding Panzerfaust to OH units would be that great... Ostheer core unit is the Landser squad and they already have Panzerschrecks, other units like Sturmpioneers already have Panzerfaust so this would only benefit the Skirmish Commander, which I think it is not a good idea to make it go closer to a tank so it can fire a Panzerfaust.