The problem I have with EI in my case is how it has been applied here on TPT. Read the Share your Dose Thread, your tank is an 'outlier' unless you are dosing around ~20ppm NO3, ~3 - 5ppm PO4, 0.4ppm+ Fe etc. etc.
You need to take that information in context. Most every one of those tanks has high light, high CO2, and loads of fast growing hungry stems. Not much in common with yours.
And much of this discussion goes right back to the overthinking fert dosing thread by Dennis Wong. In my experience, a well managed tank can do pretty well in a wide variety of dosing schemes. Seems you are suggesting here that fert dosing is the primary reason for a successful tank. That has not been my experience.
Another thing not often discussed is the actual mix of plants in any tank. When you look closely at different methods, you begin to see how folks pick plants that favor the conditions they provide. As has been mentioned, your P. Erectus and Rotala like lower nutrient levels. Vin Kutty has done numerous experiments in this area and his Kill Tank thread is a very good one. By the way, his Pogo Erectus always eventually stunted and melted away in his Dutch tank.
So the point is, plants like Pogo Erectus and something like Pantanal have much different needs. You will seldom see both flourishing in the same tank. Now some of the groups out there are preaching that there is a secret "recipe" that one must follow. While I do agree that ratio's are something to pay attention to (one of the reasons for the share your dosing thread), I don't believe there is a "recipe" that works for every tank. Actually, far from it.
In my opinion, our best tool is trial and error and observation. And this doesn't sit well with those who want to solve a planted tank with science. Each tank reacts differently, and duplicating an eco system with so many variables is pretty much impossible. It takes a good deal of effort and dedication to figure out YOUR tank. No shortcuts that I have seen so far.
In the end, sometimes the end goal gets lost in all the arguing. Show me a beautifully presented tank of healthy plants, and I am interested. Some have strayed so far from that they can't admit when someone has success with any method other than their own. A dogma can be blinding at times.