Writing is a profession. As such, writing must be able to be done daily. Newspaper journalist wrote dan publish daily even under most intense condition.
The only difference is whether the quality of the writing is good or bad that day. Even more accurately, whether the writing connects with the audience on that day or not.
We are afraid to write because fear of rejection and/or the loneliness of no reaction.
In conclusion, the thing that exist is the perfectionist's block as we want to have perfect reaction to our writing everyday.