The videos tend to be ADA vendors, so they are selling everything, whether you need it or not. Amano states' the marketing guys goaded him into offering it, but it's not required. ADA aqua soil is a nice clay soil however and works well.
That is 99% of the "system" as far as plant growth is concerned.
It also last a good 10 years I'd say depending on how you trim and change things around, except....for Nitrogen will decline to limiting levels after 1-2 years' time. So you might slowly increase KNO3 dosing for maintaining the same rates of growth later. I just use the ADA AS personally, I tried the other stuff and then tried without, I've not seen any differences to date where I was fairly sure that there was a causal effect/helpful impact.
No one has provided evidence otherwise as well.
Talk, marketing, but nothing factual where many hobbyists see a difference.
Sediment systems/heater cables are difficult to add and remove, so it's not like say adding Excel etc........few hobbyists will remove it just to see.
Heating cables we can turn on and off however(and they do not work as claimed).
But some folks buy everything no matter what.
None of it will Harm the tank or the success, only the wallet is harmed.
But we buy all sorts of stuff like that.....everyday.