Thank you Keith.

So, based on various people (including top pilots) experience the dual pack & switch is a really good solution, with both redundancy and more current, as Keith noted.

It is interesting the fact that regulators are not needed, actually: in case of a "bad" short, even that setup will not be able to land the plane... or at least, land an unburned plane!

Did I forgot one situation in which regulators can be useful, with respect to reliability of radio system?