I do EI and change the water once every month on this tank:
But......I do no water changes on this tank:
Based on the logic presented...........the non CO2 method is far superior.
But......................no one bothered to state the goal of the scape/tank/plants, general species etc........without stating that..........you have a 20 fold difference in RATES of growth and labor required.
There is no one size fits all and not all planted tank designs, planting etc works the same, EI will hit a far larger target than the other methods.........because it suggest large frequent water changes, but no dosing method avoids water changes say on this tank:
These 3 tanks illustrate a vast difference, but the dosing method is NOT
the defining factor, the light/CO2(or not), gardening required to keep it in a steady state, uprooting versus topping trim methods, stems vs slower growing rhizome type species, emergent vs submersed, algae eaters, etc.
New folks get duped all the time by manure sale pitches rather than asking them basic questions. Telling you what you WANT hear, not what you NEED to hear. Heck, the newbie does not know any better.
I've yet to meet a new person who said they wanted to get into this hobby to test nutrients. Water changes? Most accept they signed up for that. You can manage it, but most should wait a while before heading down that path and get an idea what their goal is to begin, THEN.........ask the next question/s.
So start there with your stated goal, plants of interest, scape ideas etc.
It'll help folks help you specifically.