Although much of the detail of modern AFVs is kept secret (and rightly so!), it is strongly believed that the Challenger is indeed more heavily armoured than an Abrams. If this is true or not I can't say, but the T2K designers thought it was in both versions.
Almost every country wants to produce their military hardware within their own borders, however cost and capability often prevent this. It's always better to be able to make your own weapons, ammo, etc than have to rely on somebody elsewhere in the world who may choose to cut supply, or have it cut by a third party.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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