Whatever design decision they have for not giving us universal vacuum, it's pretty much negated by the fact that almost everyone uses a sentinel to get around that design decision and it hasn't hurt the game. The only time I don't use a sentinel is when I'm kuva farming, and that's only because my cat has a very small chance of doubling kuva.
Yeah its a bit strange when they seem to want to do stuff to support diversity but then make decisions like that. I mean they added kubrow, sveeta and those infested dogs that I cant think of the name of. They put the effort into them by why use them when they dont have a vacuum ability? Its like the focus tree: sure you made 5 trees, but only one of them provides me energy and allows me to cast my abilities more frequently, why would I look at the others (well, the one that makes you go stealth is sweet). People tend to pick and build towards the path that resolves problems in the game:
energy, ammo, etc running out or drop pick ups needed: run the thing that supports universal vacuum
have a frame that has a lot of expensive abilities: run the focus school that allows for energy regen
It's disappointing that they then do half steps of "oh gee whiz we didnt think people liked this so much, maybe we will do X" and how often has that come to pass? I mean the focus system has been in beta for a few years, you would think they have the stats for what everyone runs (or even just feedback) and recognize "why is everyone using energy regen?" Further, I think the debate of will they or wont they add in universal vacuum has been going for a while with the DE response being "we will see based on fan response" every time its brought up.
I think PoE looks pretty awesome. Has a Guild Wars 2/Destiny vibe to me with the open area and random public events and quests. I am disappointed at the rebuild of the focus tree to empower the operator, some of the least fun I have had with this game. Bleeding out while my squad mates dont come and revive me is more fun than playing the operator. Its the most painful forced sections in the recent story releases and I guess kuva farming (I havent really dont kuva farming as I dont really have any riven).