Oh yeah it's great for tactics, making encounters and exploration much more dynamic and interesting overall.
If you need a conceptual way to think about it, consider that machines do not fully occupy every inch of space available to them in a given area--some are shorter (you can partially see over them), some are not as dense (you can see through parts of them, just not as fully/clearly), and so on.
If you've ever walked through a factory, or seen the inside of one, think of it like that. You can often see pretty far, but not quite as clearly as you can across completely open ground! (and the further you try to see the less clear things are, even if you'd be able to see what's on the other side of machines just fine if they weren't in the way, given the distance).
Solid blast doors, by comparison, block all vision of course.
