The shortcomings of the original Zettel method is concisely synthesized at the beginning of the link you provided.
For all intents and purposes, we often translate the German word “Folgezettel” as “sequence of notes”.
For the purpose of this argument, we may presume that the world is a web of interconnected things. It’s not necessarily possible, and surely not practical, to reduce this multi-dimensional web to a finite number of linear sequences.
My notes is a (partial) reflection of my knowledge world. I don’t accept an oversimplification of this web of ideas into a linear form. Links with context are good as they represent individual connections among nodes of this web. Sequences, numerical or in another form, on the other hand, are arbitrary. They do not represent any individual element in the web.
IMO what distinguishes the (original) Zettel method from other note-taking conventions is its liberal use of sequences. Therefore, I don’t consider my own workflow as a Zettelkasten. I’m aware there are people who do not use sequences, but nevertheless claim to be a Zettel practitioner. They are, of course, free to acquire whatever labels for themselves in this age of identity politics.