I suppose a lot of pastors have heard horror stories about someone who prophesied to someone else to sell everything and give it to the poor, go to the airport, and someone will provide you a ticket to go be a missionary in Africa, where the person followed the advice and it didn't pan out. Or they've experienced some problem with false prophecy. I certainly understand that.
Ministers of the gospel, especially pastors, want to protect the people of God. But we also have to be faithful to what the Bible teaches about these spiritual gifts. Some pastors may have experienced individuals who condemned others, claiming it was prophetic, or people prophetically pointing out the sins of others. I can see why a pastor might consider these possibilities to be scary.
There are some pastors and church leaders who teach people to not say 'The Lord says' or give a first person prophecy, but they have to say, "I feel" or "I think" or something that sounds wishy washy.
Consider Exodus 9:1
Then the LORD said unto Moses, Go in unto Pharaoh, and tell him, Thus saith the LORD God of the Hebrews, Let my people go, that they may serve me.
Could you imagine if Moses heard that and then went in and said to Pharoah, "Maybe I think, possibly...this could just be me... but I think the LORD might want you to let the people go."
That is not how God wanted him to present the message.
And it does not make sense to put a restriction on people to not point out anyone's sin through a spiritual gift when there are examples of it in the Bible, for example, Nathan with David, Peter with Ananias and Saphira. There is that passage about telling the unbeliever the secrets of his heart.
It does make sense to teach people to have wisdom about these things. Some prophecies may best be given out of the public eye.
One of the other issues with some of the churches that do this, is that they consider prophesying falsely to be no big deal. There was one man who said that wrong prophecy is not necessarily false prophecy, treating false prophesying as a normal thing. Then there are those teaching people to 'step out.' I can understand why they wouldn't want people to prophesy whatever popped in their head, and then condemn people and say, 'Thus saith the Lord.' But does saying 'maybe I think God is saying' alleviate you from the responsibility if you prophesy false? Wimpily attributing it to the Lord is still attributing it to the Lord. And if someone presents a true word from the Lord, should he present it in a wimpy way, or attribute it to his own thoughts and feelings?
One the one hand, we should eagerly desire spiritual gifts. On the other, we should have the fear of the Lord and avoid prophesying falsely like we would avoid committing adultery or murdering someone. It is a big deal.