Not to rattle any ivory towers too much, but whatever metric one would apply to quantify someone as being amongst the "most novice players" would probably relegate 99% of the people playing Civ to that category.In every civ game barbarians are a minor nuisance that can be dealt with with minimum effort for all but the most novice players.
A boost to fighting barbarians would just be completely unhelpful.
Let's be real, the percentage of players who never visit forums like this one, whose default difficulty isn't Deity, who play Civ V the "wrong" way by committing such unthinkable transgressions as building workers instead of stealing them, or by building armies with more than just masses of archers, or by not fast-tracking a Great Library, or by not beelining to Education, or--horror of horrors--settling more than four cities....It's actually a pretty high number.
Most players don't have their game down to an optimized formula. For them, the game is very much a matter of experimentation. Maybe the 1% doesn't find a bonus against barbarians to be meaningful, but that still leaves plenty who would.
At any rate, aren't barbs getting their act together a bit more in Civ VI? Don't they send scouts out while amassing a sortie at their encampment?