That's the kind of mistake people make, I think, when they say that we should not be like Philip today and listen for the special direction of the Spirit in personal evangelism. The Bible doesn't rule out that special guidance and the Bible doesn't take its place. All Scripture is inspired by God and is profitable for teaching, for reproof, for correction, and for training in righteousness, that the man of God may be complete, equipped for every good work. If people are neglecting meditation on Scripture in favor of impressions and special words, you can be sure that their spiritual faculties will not be well tuned to hear the truth. That's the way most cults and sects start.
Someone claims a revelation and gets a following.
That's why the Scripture is given to us as our only infallible and sufficient rule for judging all claims to divine guidance. But it is dangerous like knives are dangerous. They can hurt people, but we don't outlaw them. Because, when rightly used, they are so helpful in preparing food, we don't want to do without them. I am sure that most of us have a long way to go in simply obeying what we know to be right to do in our everyday life.