Small tube amps are for home or studio use
Large amps are for gig's
Large amps do not sound great when played at low volume
None master volume amps are much to loud
Heavy sounds need HUGE amps and speakers
Thanks to the KPA: All this limitation is not true anymore.
I got some of my greatest profiles out of very small amps - and can use them now at high volume.
Now we can use none master volume amps - fully cranked - at home
Some famous bands use large (empty) Marshall walls - and mic a small amp behind the stage - to get their BIG tone - we can do the same at any volume - without the need to color the sound with a mic.
Don't be afraid to profile your (or your friends) small amps - and be amazed.