As far as I am concerned, whatever it is that these kinds of people on this board claim has been revealed to them is valid for them alone. I do not have to accept it as true in any way, and I often do not. Private revelation, if it is even revelation, is binding on no one but on whom it is revealed. In this, it seems that I am in agreement with you.
As for the rest, YES !!!
We are expressing out own opinion, just liek you are and everyone else here.
Just like the Apostles did and the chruch fathers did and scholars and writers have done and are still doing TODAY.
Do you believe God communicates with his followers via prayer?
I think I read earlier in this thread and others various instances of a believer saying "Yes I was confused about such and such, but I prayed about it and God revealed to me so and so...you should do the same."
That is where it no longer becomes just your opinion on a matter. You've asserted an absolute - that God discussed a topic with you. Therefore there are only a few options if another believer comes along, claims that they also talked with God about that topic, however they received an entirely different answer.
1. You are full of it.
2. They are full of it.
3. You're both full of it.
4. God is screwing with you.
Maybe there are a few other conclusions, I dunno.