If you get an ICP MS from oceamo you do get the insight into those parameter the OES can’t really detectWell, Oceamo and ATI do the same. With the former however, they can help you adjust your recipes if needed (like, adding more of a certain trace), or if you have a massive tank where you can't set it straight with a chunky water change, you can get an 'all in 1 or 2 bottles, dosed over a month, to try and set it straight' tailored JUST for you. Instead of buying 15 different supplemental bottles.
So to say oceamo is doing the same as FM is wrong
In my opinion oceamo is the only ICP worth getting because they do not guess but can say for sure where those parameters are