Sieving soil fines less than one eighth of an inch is necessary--NOT. Sieving soil hasn't been necessary for 50 years.
Always use Akadama--Nope, it's an unstable aggregate, high in finer clay particles that break down (unless it's the high fired stuff). It has no trace of organic material, but it isn't sterile as often claimed. It is used in Japan because of its aggregate structure, which can be replicated in the west with MANY different, less expensive and more suitable materials.
Organic fert cakes are da bomb--Not really. They Look fancy and they were the modern way to feed 50 years ago. Now they're just slow to work, ineffective overall and maggot magnets if you can keep the squirrels from stealing them.
Let tap water sit for a day to clear chlorine--Useless fear. If it's good enough for you to drink, it's good enough for bonsai. Chlorine is an essential element for plants and is required in relatively high amounts anyway.
Biostimulants, like vitamins, auxins, cytokinins and salicylic acids or other plant or animal extracts are beneficial. Uh-uh, nope...commonly available INDEPENDENT research haven't shown any support for the claims. I will quote here "Most biostimulant products independently tested were verified to have no beneficial effects on plant health. Testimonials don't count. Testimonials are advertisements...What works in field soil crops won't work in a bonsai substrate devoid of organic matter and microorganisms."