I've had recent 1v1 duels where the opponent just dug down and camped under the ground and it brought it to a draw. This tactic is annoying, and I think it should be removed. You should be able to remove blocks that you or your opponent placed, but not blocks you didn't make. The only exception is Explosive Bow (which should be removed but let's talk about that later).
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if you think this should be implemented, maybe with 1 or 2 changes.
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if you think it's a good concept that could be made better with a few changes.
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if you think it's a bad concept with several flaws.
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