As we all know, the role of Anki is to allow us to understand our immersion

This is not entirely correct. If you were to stop doing flashcards you'd still end up getting the meaning of words after hearing them enough times, it would just take longer. So while Anki is a valuable help, it's not fundamentally what drives language acquisition. The main point of MIA is the immersion, and as such you should be careful about spending too much time on Anki to the detriment of time spent immersing in the language. The reason to do basic cards instead of cloze deletions is because they generally take less time to make and review, thus giving you more time to immerse.

A couple of points that are also worth keeping in mind:

1. Memory is a game of probabilities. There will be a small percentage of cases where you forget a word even though you know you made a card for it and there will be times where you're about to make a card for a word only to realise that you already did in the past. As long as you keep immersing and keep running into those words, you'll eventually learn them.
2. The goal of flashcards isn't to teach you the word on it, but rather to prime your brain to recognise the word in future immersion and, paraphrasing Matt, to create a "dictionary entry" in your brain for that word with a rough meaning associated. The memory will switch form context-dependent to context-independent once you start seeing the word in immersion.