I didn't say you shouldn't read simple sentences or do other activities. Variety is useful. I said early on the most efficient use of your time is memorization

I didn't say you shouldn't read simple sentences or do other activities. Variety is useful. I said early on the most efficient use of your time is memorization of words and maybe grammar. Duolingo does that well, in my opinion. It doesn't do the usual flashcard stuff, but it does favor repetition and you can practice speaking and listening from the first time.