Most language learners are not in the country where the language is spoken. If they are visiting the country it is certainly fun to try out a few phrases. However, for any meaningful communication, most people will be better served using English if they don’t know the local language. I am not saying one should try to learn a few phrases, but rather that it does not really lead to much in the way of language learning unless it is followed up with a long period of input based learning.
I also doubt that speaking early creates bad habits, and have never understood the forced “silent period” strategy. When to speak should be a matter of individual choice, as well as opportunities and needs. There is not need to speak early, and it can be an imposition on the patience of the native speaker.
Speaking early will not ingrain bad habits, in my view, but a lack of sufficient input leads to a poor level in the language, as evidenced by ex-pats, or immigrants, who develop a limited range of survival phrases they can use. When I lived in Japan, most ex-pats could say hello, goodbye, wonderful, bad, two beers, beautiful etc. in Japanese. However, only those who invested time and effort in input activities advanced to any degree of fluency,
You need a lot of words and phrases to be fluent and to communicate meaningfully. These can only come from outside, from input. We don’t have them in our head. Nothing wrong with speaking early but it is not necessary and not a strategy for language learning. For many people, input activities, reading, listening, watching movies etc. are rewarding activities in their own right, and they do prepare us for speaking. When to speak is a matter of personal choice.
I will not be doing a lot speaking for the first few weeks of my Korean challenge, although I will inflict my Korean on any Korean speaker that comes within range here in Vancouver, even though I may not understand most of what comes back at me. This is not communication so much as showing off. I do it because I enjoy doing it, but not with the thought that it will advance my Korean a lot.
I am hoping that my present level in Korean is not that far off a level where I can start meaningful interaction with Koreans, and when I reach that point, I will talk more. But that is my preference.