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I don't think an unknown raises overs enough to make betting more profitable than checking. I don't think it gets checked through very often, and sometimes you will be able to make a good fold if it comes back to you for 2. Or checkraise the PFR if it is folded back to you.

If you have a read that says that PFR is aggressive enough to raise overs, or one that says he wouldn't continuation bet the flop, then I think betting is fine.

I used to bet into the PFR a lot in these spots, and I still think it is a reasonable play, but I have come to like checking unless I have a reason to believe he'll raise a worse hand.

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I like your reasoning, and if the flop came out J64r, I would check and see what develops. But on a flop of 864, I feel that the probability of the hero having the best hand is high enough to justify a bet. But i certainly cant disagree with how you approach the situation.

Conceptually I look at 106 on an 864 board almost the same way as if I had AT on an T64 board. Obviously those situations are not the same but I would play them the same in that situation.