@Gabe West. I can't think why this would EVER be helpful. If you don't want something in your personal inventory, you'd put it in your hotbar anyways. The trouble comes with a full hotbar.
It's just SO annoying. Bundles are a GREAT temporary solution, but since they can only fit one stack, you have to MANUALLY make it into one item if you wanted 64 different items in your bundle (stackable items only) or depending on how much, if you wanted 16 different items for instance, you would have to reduce each stack to 4 blocks before putting it in the bundle
One more solution I found is throwing out the items onto the floor instead when you have a full hotbar. It's just SO MUCH QUICKER than changing everything out of your hotbar. Again, this whole issue should still be reverted, BUT, this is a good tenporary workaround