@ghdprentice captured it well in his comment
that said, the use of a tube power amp depends alot on the chosen speaker and its demands
to get the full dose of what tubes do to the sonic presentation, once one decides they like it, ideally the system is all tube
and now having said all of this, and having been a tube-o-phile for some 30 years, i do not have a single vacuum tube in my current system... LOL