Mikhail,
Hlop wrote:Huh! How would I know if it's not doing something till I face such situation but it will be too late then

It's not usually the case the the tripod and head combo won't - absolutely - do something, but more the case that you'll see an area where it doesn't do somethings as nicely or as effortlessly as you believe it should.
For instance, shooting panos will be infinitely better using one of the high end ball-heads. I know that's a deficiency in my current setup, but as I've yet to feel even a remote desire to shoot a pano, I'm not at all bothered by that deficiency.
I also know that - due to pretty much the same basic design deficiency in my current setup - I might expect issues when shooting videos and expecting to pan the camera smoothly while, say, following someone walking across a given area.
Again, this isn't an issue I'm concerned about, because it's not a wall I'm going to bump into all that often.
I understand the theoretical limitations, but for me that's exactly what they are - theorectical.
Consequently, I really don't give a damn!