I'm sorry but I don't agree with you. In my opinion methods of learning all foreign languages are the same. I don't think that every single language or language family require different method.
Maybe all languages from the same family.
Of course grammar is important but not for beginners. For beginners is important everyday listen to a lot of target language.
If you listen to tons of native material you will understand next to zero and you won't progress. That's why they suggest "n+1" or "comprehensible input": listen or read material that is only one step more difficult than your current level and you will progress fast.
Grammar is not a monster - on the contrary it is very useful, especially for beginners. We are not children: from one side, we have qualities and knowledge that they don't have (we can read, we have been in school, we already know one or more languages,...); on the other we might have lost some of their ability to "intuitively" learn languages, and we are not actively immersed in the language - with "actively" I mean your mum teaching you, repeating, correcting, encouraging.
Grammar often makes it easier - I don't mean to learn by heart all declinations and conjugations, but to understand why something is like it is and to have a clearer picture of the language.
As an example, take the popular course called Pimsleur. They avoid on purpose all grammar terms, but in doing so they have to take plenty of difficult steps to explain even the most basic concepts of the language. It would be much easier, and faster to learn, if they'd allow some basic grammar, as in "what is a case".