To hear God's voice we need to know the spoken (Logos) and written (Grapha) Word. Then we can know the living (Rhema) Word.
If the prophetic is not rooted in the Word, you can get ineffective words because it's from human inspiration and not Holy Spirit.
Yahweh does not give general words of knowledge. Every good and perfect gift is from above, coming down from the Father of lights.
It's good to encourage but even unbelievers make good motivational speakers. Believers can be special utensils for honorable use.
'For the prophecy came not in old time by the will of man: but holy men of God spake as they were moved by the Holy Ghost' 2 Peter 2:21
Gifting is no different from maintaining an increased proficiency in foreign languages or going to the gym to maintain or increase muscle. 'You don't use it, you lose it' Matthew 25:29
People operating all the time, cannot accept this perspective because they never stopped. Todd White, Dan Mohler, Blake Curry.
Any believer who consistently operates in healings, the prophetic, and casting out demons cannot accept a lesser (false) reality.
'If it seems we are crazy, it is to bring glory to God. And if we are in our right minds, it is for your benefit' 2 Corinthians 5:13
So God has been faithful to anoint good stewards for the Kingdom work, while they work He will grow them in wisdom as well.
In fact, people consistently walking in power cannot help but be outraged at such a soulish perspective...it is a carnal attitude.
You can be filled with Holy Spirit and still think like a child. Bad spot to be in, throwing tantrums at every Bible Scholar.
'Brothers, do not be children in the minds. Yet in the evil, be little children; but in the thinking, be full grown' 1 Corinthians 14:20