I am not disputing reading in the language learning context as a tool for learning, especially when combined with SRS. Doesn't really apply to me since there is no widespread written component for ASL.
By reading, I meant people rereading their old notes instead of actively challenging themselves. That is, no attempt at retrieval-practice that is the basis for spaced repetition. Research said that study method is often regarded as effort in vain.
But that apply to contexts such as studying biology. Reading in a foreign language is a different context in that you are also learning new materials and practicing retrieval at the same time.
Anki is great and I'm a contributor! But it's more of an ancillary tool. SRS shines when it comes to memorizing decontextualized, atomic information (e.g. countries and capitals, the periodic table of elements or writing Japanese kanji), but not for learning a language in general.
I don't see how it's impossible to use anki for contextualized learning. It's the whole point of sentence mining. Rather, with no context, it's essentially useless since I wouldn't know how to use it in context.
Periodic table is a great example for this. When I don't know the answer to questions anki posed, I used related information to retrieve what I need to know.
In my case, I have no reading materials to sentence mine, so I just mine ASL videos.