I agree Mitch but the health officer who was mentoring me during the change over suggested it as a thing to focus the mind somewhat having live fish in a to be cycled pond I remember being paraniod as hell as things started to creep on up on the test kit readout telling me to stay calm and not to panic because its all going to turn out well , remember we'd kept indoors for 22 years and were usd to an ordered tank with perameters that had been stable for many years we can laugh at it now all these years later but not at the timeIf feeder fish are used as food for larger fish, I don't have a problem with that. (as long as it's an appropriate food - that's another discussion...)
I don't know why fishless cycling is not promoted by fish/pond stores.
It seems to me to be a great way to increase education about water quality testing and sell more water test kits.
Dave