Their 'best practices' explanation is simply saying not to turn on speakers connected to the unit before turning on the unit.
Makes sense, and true it is best practices.

For one it avoids the power on surge to the speakers, which in/of itself is worth following.

Have you tried this?

If it solves the problem, it may be that a simple adjustment in workflow/discipline will solve it.
Not sure why their unit has such issues but if a simple better workflow actually solves it, well..

FWIW I hate when people fire stuff up in the wrong order and I hear that 'pop' (especially in headphones).
/just sayin

I do not work here, but the benefits are still awesome
Make your sound your own!