Can someone explain why ETH 2.0 needs a layer 2 solution?

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Can someone explain why ETH 2.0 needs a layer 2 solution?

Maybe this is my ignorance but … what's the trade off in current layer 2 tech & ETH 1.0 and when ETH 2.0 comes out what's the trade offs then?

submitted by /u/pjonson2
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