It was common in Quake multiplayer deathmatch (in the late 90's) to have to "flick" the mouse to shoot at a player that spawned behind you, so it was important for mouse sensitivity to allow an easy 180 degree turn before the mouse reached the edge of the mousemat. An issue with this level of sensitivity was that you would often be a few degrees off after making any flick, so you'd have to quickly make a correction to finally place the crosshair on the target player.

Counter-Strike was less chaotic, as you had a pair of teams starting at opposite ends of the map, resulting in firefights usually being infront of you, so players in CS sacrificed the 180 degrees of movement to focus on engagements ahead of them (or 90 degrees at most). This level of sensitivity gave a potential competitive advantage when trying to aim at (and track) a player ahead of you because you were less likely to need to make a correction (a player was more likely to lose a duel if they were slowed down by having to make a correction).

There was a disadvantage to having less than 180 degrees of mouse movement when reaching the edge of the mousemat, as for example if you only had 100 degrees of movement before reaching the edge and you wanted to aim at someone behind you, then you needed to move by 100 degrees and then lift the mouse and return it towards the middle, before setting it down and moving it for the last 80 degrees - this could be done quickly, but the slight delay made it less likely that you'd win the firefight (although the opponent probably won the firefight if they got behind you anyway).

I grew up in the days of Quake, and was used to making long flicks, but when I got into playing Counter-Strike: Global Offensive competitively (which was the common way to play it around 2015) I often heard comments about how extreme my mouse sensitivity was (I often did 360 degree spins for fun when I jumped) before I changed it to a more common sensitivity.

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