As someone who barely scraped by the Kanji/readings of my N2 but have to do a chunk of my work in Japanese, I gotta disagree.
Sure, reading isolated sentences with only 90% coverage is really hard sometimes. But usually you're reading whole blocks of text, so you have context. Also, maybe you don't know some kanji but it has similar radicals to other, so you can make educated guesses (only sometimes of course).
I mean it's just like English! There are radicals/etymological clues, there are context clues, there's so much that you can work off of to figure things out. And exercising "figuring things out with partial information" is a valuable skill that can compensate for a lot of missing kanji knowledge.
An aside: I've heard that when learning a language, you should be able to understand roughly 80% of what you're reading/listening to, because then you'll have enough of a base to not feel overwhelmed, while still having new stuff to absorb.
Sure, reading isolated sentences with only 90% coverage is really hard sometimes. But usually you're reading whole blocks of text, so you have context. Also, maybe you don't know some kanji but it has similar radicals to other, so you can make educated guesses (only sometimes of course).
I mean it's just like English! There are radicals/etymological clues, there are context clues, there's so much that you can work off of to figure things out. And exercising "figuring things out with partial information" is a valuable skill that can compensate for a lot of missing kanji knowledge.
An aside: I've heard that when learning a language, you should be able to understand roughly 80% of what you're reading/listening to, because then you'll have enough of a base to not feel overwhelmed, while still having new stuff to absorb.