it would be nice to have this by default and "tag": "forge:shears" instead of "item": "minecraft:shears" in all loot_tables (cobweb, leaves, grass), so it is easier to use custom shears on custom leaves etc...
if someone add new shears, they have to replace all the loot_tables and if you Play with custom shears and a mod with new trees, you have to edit all custom leaves loot_tables manually...