Guitar players help me please ! Is it necessary to use a boost pedal when there are only one guitar player in a power trio rock band ?

I know when we play guitar in a band and there are two guitars, a rhythm guitar and a lead guitar, It's necessary that lead guitar player increase the volume of guitar using a boost pedal or any pedal used to increase the guitar volume.

But I have a question, imagine a power trio rock band and within there is a bassist, a drummer and only one guitar player, when the guitar player is gonna play a guitar solo, is it necessary to use a boost pedal to increase the guitar volume enven though there is no a rhythm guitar player ?  

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Sorry for my bad english !

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