I am already aware that a preposition after a verb turns it to a phrasal verb, which happens to almost have a completely different meaning from the verb alone. However, I noticed a very frequent usage of "out" which in many cases seems to me to be kind of redundant, and those are not meant as phrasal verbs, as far as I know.
For example, why saying: "hear me out" instead of just "hear me", or "help me out" instead of "help me" and so on?
There are also other cases like "put your hands out in front of you" or "turn your hands out externally" etc. suggesting an "outward" meaning.
So, why is the preposition "out" so widespread in English?