hearing people need to interact with the Deaf if they wish to learn ASL.
Yes, I agree language has to be used to be mastered.
But in the very beginning, immersion can be inappropriate, and it can lead to burn-out, confusion, and needless frustration.
Some people can learn a new language very quickly, but I've seen that most new language learners want to start really slowly:
A whole month or more just learning the new writing system / alphabet, while learning about basic cultural aspects.
Another month just on basic stuff like "My name is.." and "This is a..." and common phrases "hello" "thank you" "sorry". Still not enough to hold a conversation.
Another month or two to learn the placement (grammar) of negation, modifiers, adjectives, verbs.
I'm not saying that newbies should avoid immersion situations, but that newbies should not rely on immersion to be their sole source of knowledge.
I think students have to make some personal effort to learn the language, be it take a class, get a tutor, or set aside time each day or week to study from a textbook or spend time trying to read books or watch&summarize TV in the target language.
I guess I see language acquisition like learning to ride a motorcycle for the first time:
You could go to a dealer, buy a motorcycle, join a motorcycle club, and hope that by hanging out with the motorcycle club that you can become a competent rider. Someone might be nice enough to teach you about the throttle and the shifter, but there's a chance that you may fall over, run out of gas, or be left behind and treated like an outsider. It may be that you have never rode a bicycle and do not have a sense of balance.
Some things are not as simple as they look!
OR:
You could research different kinds of bikes, take a class where they can teach you how to ride and basic motorcycle care and be informed of laws about riding a motorcycle (wearing a helmet, how to park..etc). It may turn out that you don't have the ability to ride a bicycle, so that you have to try extra hard, or give up.
Also in class, you may meet other people who share your interest in motorcycles, and you can help each other out and learn from each other because there are mistakes that are common for newbies.
They are two different ways to learn, but one has a very steep learning curve, and one has a fairly flat learning curve. I think people are more receptive to learn when the material is broken ahead of time down into chunks they can handle.