1 #Bitcoin = 1 #Bitcoin
1 Sat = 1 Sat

Fiat terms are irrelevant.
₦1 ≈ 1 Sat, but Nigerians don't get cheaper fees.

I think in the future Bitcoin on the Basechain will be used much like gold bars of old, for the bulk of wealth preservation. Expensive to move, so only used for large sums of sats, for large purchases, or withdrawals to L2.
L2 will be like the banking level, where your accessable savings will be. Only you can be your own bank, or trust a custodian.
L3 will be for daily use and the payment layer.

Just think about the sats we are passing around just now, and how they will resemble on-chain pizza purchases of olden times.