I completely agree, there could be “N0” level Or call it “reality” like in WK
However, there are many grammar points that are technically not part of JLPT but they are so incredibly common that putting off learning them is just silly. Example of that would be a lot of grammar points that I myself have included in the first message of this topic. Many of the things on that list I encounter daily while reading manga, and you can imagine if that stuff is in manga it’s definitely not super complex literary grammar only seen in genji monogatari first edition
So, maybe there could be an alternate path that follows frequency and usefullness, rather than JLPT order. Then I’d switch to that patch myself, rather than continuing using JLPT as the main path (as long as it includes ALL grammar points that exist on the site).