the going statement in the reef masses is that cycling with fish is bad, but there's a catch. that can't be a blanket statement, its rare that fish-in cycling actually burns fish (we do not accept that ammonia burnt fish act ok...see mariculture and aquaculture data on free ammonia tolerances for fish, its tight, like kidney control is for animals in general)
Ive never met anyone who put fish into a dry setup without using bottle bac. if they didnt use bottle bac, the fish will dart/gasp and die overnite, max 2 days, water cloudy all fouled...a clear crash.
but the reason all these setups are doing fine, and fish never dart or die, is due to the power of bottle bac. I always find it odd that as a hobby we can't let go of old cycling timeframes, but we're ok not downloading songs at 45 mins/5 mb anymore. We're ok with laser fast data, but laser fast cycling NO GO
the proof of your cycle is literally in the results. the risk of fish-in cycling is disease vector, its not a cycling heresy.