Bell pitting is basically a foxhole dug with whatever tools are available. Machetes do the start, some shovels and picks and hammers may participate eventually. The pit itself goes as deep as possible or safe, sometimes vertical, sometimes horizontal, but never level. It snakes into hill sides, drops away, joins up with others, goes straight up and pops out elsewhere.
You can't compare amber to other gemstones that ought to be flawless. In those you will never find biological matter like twigs and bark or a flower, neither a feather or a scorpion, not even a spider or an ant. So, are inclusions good or bad? It depends on how they are placed and what they do to the stone. These and other characteristics of amber are different from other gemstones.