hmmmm
A tenuous dilemma.
The cult of the kill seems to be breathing down our necks pretty hard here. I think, perhaps, the crux of that matter is that snipers want to have the pulse pumping, moment by moment action that other weapon users have. The need to rack up kills to level into the system makes it NECESSARY that one curtail their builds for that purpose.
If the game literally has no room for snipers to sit back in friendly controlled territory to snipe, that is unfortunate, but I fear that is leaving out details. I also feel that the video chosen by the OP was diametrically opposed to this style of play, even maligning the methods used by snipers to defend themselves in these circumstances.
I am cautious in asserting my personal experiences, so please take these next items with due accord. I have enjoyed sniping in the past. I have despaired the process of moving from one sniping location to another, because that is when the sniper is supposed to be most vulnerable (I a address this further down). The rewards, however, for getting into enemy territory and sniping my opponents from a tactical position are profound. Therein... there are tools for those whom need to A travel as a sniper, and B defend a sniping position. Most war based FPS has included them for some time now. Explosives applied as a form of perimeter control buy you time and a warning if you are being approached or have been detected. Lastly, fighting off attackers is the height of excitement for this model. Not because you need to KILL the person, but because you should already have an escape route planned, and a reason for them not to follow. A volley of bullets from a pistol and a few well places grenades will leave a sniper in fine condition to slip away. A SKILLFUL volley of bullets and a well placed grenade will kill your attacker and give you time to choose a new position.
Then again, perhaps I play for the wrong reasons. As I mentioned initially, the cult of the kill dictates that you must achieve the highest number of kills, in the shortest period of time, dying as little as possible in the process as a subordinate concern to the previously stated primary objective. I have my builds I used for that. I also have builds I use for fun.
TL;DR
So I heartily recommend, but do not find myself so bold as to admonish, that we all remember to have fun while playing our games!