1. Optimistic person. And if saying "this idea might just work" encourages people you love to try things, then it also helps people you love.
2. We could debate on what "overly" means. If you believe you will win the lottery this is just stupid and naive, but if you believe you can start a profitable restaurant this is not overly optimistic. Still you must not be stupid when trying.
3. This is debatable. This statement is very broad.
4. Correct if you are realistic and not pessimistic. My hot take should be formed: "People who claim are realists are most often just pessimists, who will pass all ideas as bad". Actually to continue from here we should exactly define all the words we are using. And in this case it would not be a hot take anymore. Also I believe to decide to try and take interview you must feel optimistic about it instead of pessimistic.

My hot take is targeting "realists" who say: "Your idea is bad. Do not pursue it. I am just being realistic." Even though their idea has maybe small but fair chance of succeeding. This is just discouragement - which is more often seen in pessimists.

Actually at this point I do not even know enough about words and definitions to continue.

I think we should actively try to encourage each other to act, also by believing in others ideas (still do not believe in winning the lottery).