I'm not sure the translation works on that one Lasse

(I think I need more coffee). But I agree. Some other things to point out about powders is that they often contain anti-caking agents. Many salts also do (the residue you often find after hours of mixing some salts).
Core7 is also extremely concentrated. Whether this is an advantage or disadvantage in every situation is up for debate, however the process used to get it to that concentration is what makes the difference between the core7 and the older base elements. You can't replicate that at home, mixing salts.
AFAIK, and correct me if I'm wrong here, you (and no one outside of Triton) actually knows the full chemical composition of Core7 (we know the elements, but not the ratios). I'd say that was the same for any such manufacturer.
Each method certainly doesn't use all the same chemicals however, having used others in the past and found contaminants in the tank along with elevated levels of other elements, which were not expected.
Far from being "magic", with Triton, I know that the testing service is very good, backed by knowledge and expertise and I know that I can rely on the supplements being of a very high quality and pure (I know because I conduct regular ICP's after dosing and haven't had contamination issues) and they are a known concentration referenced in the rest of the system (ICP's, corrective actions etc).
When I supplemented with Potassium from another provider, I found it also contained a number of other elements, in high levels, not referenced on the label. Whether intentional or contamination, I wanted Potassium and ONLY potassium.
The Triton Method itself is probably of more value to me than purely dosing solutions, which is why I use it. If you're happy using other solutions, then why not go ahead and do so. Forgive me, if this comes across as a little harsh, but I see little point in you posting on a thread about the supply method which you seem not to like or want to use.
Sorry if I'm missing something or coming across as overly harsh.