They are very easy to care for, no water changes, stable, lazy tanks, generally easier plants, or at least a good part of the biomass are more aggressive easier to grow plants.
There's just a very strong CO2 enrichment bias on most forums/boards.
Many just do not know how or assume it cannot be done or cannot keep their medddling hands out of the tank, or cannot stand not to do a water change.
For those that espouse "Less is more", I cannot see why anyone would not be all for this method. No CO2 takes a huge headache out of all this. Growth is pretty slow except for a few of the faster growers, but the results are actually quite nice.
The tanks often look better on any given day than the CO2 enriched tank
No testing, no dosing(well, fish food and maybe once a week dosing if you want to tweak some), no water changes, no CO2, cheap etc.
Balance that fish load with the plant biomass and things will go well.
This is often a goal for many newbies, but they are often bull dogged into CO2 enrichment and/or high light.
Excel can add another level of tweaking and algae control if desired or if you want to do more fish loading and need to do more frequent water changes monthly, 2 weeks etc.
Then you can grow virtually any plant with that method(Excel, some traces(TMG etc)). I saw some awesome planted tanks recently in Taiwan that had no water changes, no testing, not ferts other than Traces, soil sediment, Excel and a fish load.
They had not done any water changes for about 9 months.
Looks as good as any CO2 enriched tank as far as the method.