Whether you need trace element supplements and how to provide them is a very difficult issue and there is no perfect answer that is not very tedious and expensive.
B-ionic is designed to supply calcium and alkalinity. Two parts have an inherent issue that they must provide many elements that are present in seawater or the method itself (not just tank consumption) will lower all of these elements (we can discuss the technical reason, but it relates to rising salinity due to adding a lot of sodium and chloride).
What such methods won't do is offset the demand for elements from organics that are not calcifying. Macroalgae, soft corals, microalgae, etc. All of these take up elements such as iron.
So I would not assume that B-ionic adds all the elements that you may need, but I also know that following the Red Sea program will add some of them whether you need them or not (possibly raising ones that are already too high).
So in the end, it is likely to be trial and error on what benefits and what detriments your tank, unless you go for a full blown testing method with lots of different supplements (such as Triton).