You were definitely were comparing those two lmao. Anyways this just gets worse for you, the “potential A3” would loose more of the round due to the explosion of the era than what it looses due to the tip existing, you would then also be left with a damaged round and blunted tip which would have worse performance. The steel can preform two jobs one it puts less impact pressure on the armor which prevents it from setting itself off, or two can sustain the blast pressure a bit better than the DU can which is what they were trying to explain to you.