You wouldn't---it damages the coating and shortens the tube's life.
It leaves no other traces.

>Then only if the B+ is high, say if you are using 211 triodes or somesuch why is it an issue?

Only applies to oxide cathodes or oxide-coated filaments. Power tubes with thoriated filaments (like most 211s) are not harmed by it.

>the case of the surge circuit wouldn't you want all switches and/or relays out of the circuit

I don't agree in the case of COMMERCIAL amps. They have to be reliable and usable. You can wire your own amp however you wish. And accept any reliability issues that result.

>whatever happened to that nice PP 2a3 amp J. Eckland built?

He's still got the thing and it does sounds great--but not as good as the KT88 amp!

>When are we going to hear from Natalie Stone

Beats me--ask the publisher.