I'm at about 40 years into the hobby and my experience tells me that fishless cycling is some kind of "politically correct" way of cycling a tank, as if there were such a thing.
sounds to me as if having to add ammonia, test so frequently, yada, yada, yada, is a bit silly and pretentious.
I just finished cycling a 30 gal salt tank with three damsels, a banded coral shrimp and 5 hermits, no issues whatsoever.
It just requires understanding what is happening when and how the fish will respond. I use the fish's behavior in unison with testing to determine if a water change is needed.
You actually need to be more cautious when cycling a tank with "live sand" or with seeded filter material or whatever.
Sure it jump starts the cycle, but the downside is that you end up with elevated levels of ammonia, nitrite and nitrate concurrently, whereas cycling a tank completely fresh the cycle goes through the definite stages; ammonia>>nitrite>>>nitrate.
That is something to be aware of when seeding a new tank, elevated levels across the board do more harm than levels going up and down in stages.
but having said that, I am still a big advocate of using "live" sand/rock and seeding with "good" safe material, just have to keep a clo0ser eye on it for the first couple of weeks.