You're letting something known as loss aversion affect your judgement. You don't actually lose anything if you're playing a non-ranger class and you use the new bone glove if it deals ranged damage. It's like using mechanical glove (or its upgrades) for summoners for using whips, even though the damage boost doesn't apply to whips.
You might be missing the part where Ranged has balance-dominance for large stretches of the game and generally doesn't need even an ounce of favoritism towards it.
IF I gave it a specific class damage (and I won't, because it is a purely damage-centric accessory), it would be Melee or Summoner, in all likelihood, purely from a balance perspective. Magic doesn't particularly need it, Ranged REALLY doesn't need it, and Melee/Summoner have the most catch-up work to do at the post-Dungeon->Wall of Flesh tier.
Of course, that is all to say nothing of the fact that I expect very few Ranged users will actually be at any sort of loss over the "loss" of Bone Glove-classic; this is probably a buff for Rangers any way you look at it, assuming players even use it. Admittedly, its hard to predict how popular an accessory will be in the long term, especially with limited slots. A part of me mourns for the loss of one of the few remaining vestiges of the "Thrown" class, but I don't think sacrificing this entire Expert boss drop for that cause was worth it. I'd rather it be useful (and I'm hoping people find that this is). Supplementary damage/DPS boosters are rather uncommon prior to Wall of Flesh.
EDIT: Note that the above doesn't mean I don't have buffs in store for various pieces of Ranged equipment. The more I look at Ranged, the more I find that it is a class characterized by a small/moderate number of weapons that fall very high above the average in potential, with a large quantity of underutilized weapons that fall far short of it. I've tried to take the approach of taking the edge off these "high performing outliers" while improving the under-utilized weapons/ammo, so that a more moderate average performance can be reached. Holy Arrow/Stormbow was the quintessential example of such an item, and Ranged players will note my improvements to Marrow, Ice Bow, Hallowed Repeater, and Phantom Phoenix as the other side of that balancing act. Even if true equality hasn't been reached, reducing the gap is an admirable goal, in my eyes.
Out of curiosity, what are people's thoughts on the Rocket/Grenade/Proximity Launcher/Stynger changes? I haven't heard much about those (probably because pre-Frost Moon Rockets aren't often used).
