There's a reason why valve has not removed this feature, its to keep new players interested in the game.
If new players absolutely suck, they can get a random crit once and a while and keep them engaged.
Also with the damage/crit ramp, its also to make it so its not impossible to get to a 10 killstreak.
Overall I don't think we should get rid of Random crits(They are fair and balanced *le lenn fac*). tbh, this seems to be made out of anger of being killed by a random crit.