Well, I don't know much about the historical use of slingers, but these have been my in game experiences with slingers and other ranged untis:
First of all, in M2TW, as others have said, archers and crossbowmen (but not handgunners) gained the ability to fire over obstacles in an extremely tall arc (pointing their bows or crossbows almost straight up as others have mentioned), something that actually rather does remsemble the "plunging" sling fire supposedly mentioned in the article. I haven't played that game in a while, but I remember this sort of fire being extremely inaccurate and I also recall having a tendency to go out of my way to ensure that my ranged units never fired on the enemy using this method (as to do so would, for the most part, would merely be wasting ammunition). I for one can't see any reason why slinger's couldn't be allowed to have this ability in EB 2, particularly when its impact on gameplay (from what I recall) is minimal.
Back in EB, meanwhile... I've been playing through a Makedon campaign lately and in my main army, two units of Cretians and two units of Spendonetai have been in direct competition almost the entire way throughout the campaign, the interesting thing being that there's almost nothing in it in terms of their effectiveness... Both the Cretians and the Spendos seem to get similar numbers of kills in each battle and three of the four units are on two silver chevrons (one of the Cretian units is on one silver). Additionally, in siege battles, by setting them up along the edge of the deployment area closest to the section of the town's walls I intend to assault with my rams, both the Cretians and the Spendos seem to have absolutely no trouble firing over Tier 2 walls (the bigger wooden ones) from that position... I don't know whether this indicates that slingers are overpowered in EB, but I think it may be something to consider...
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