At times my system sounds different and can fall broadly into the above categories. Those differences make me to listen longer at times and to switch off at other times.
I have now realized that it is my mood
that influences how my setup sounds most of the time.
Moody makes the equipment warm, Lackadaisical makes it dry and neutral, Enthusiastic - Lively and Detailed, Emotional/Romantic - Musical and soulful.
That said amps do sound different, but above classifications are still very subjective.
My current flea dollar amp does sound musical, but will make most audiophiles scoot when measured.