Idea – Should The 5 Volt USB Standard Be Adapted To Battery Voltages?

I think this question is kind of interesting.

Why should we waste energy regulating voltages of batteries.

Is it not better to change the USB standard voltage of 5 Volts to something that is efficient with todays batteries and the future?

I’ve read that almost all lithium polymer batteries are 3.7V nominal. I guess that 2 x 3.7 Volts could be interesting. ??