This is exactly what I do, and for exactly the same reasons.

I don't do any kind of content based filtering in part because some of my users do anti-spam, anti-phishing work, so of course they need to be able to talk about spam and phishing, and they need to forward along spam / phishing, without worrying about filters.

Also, every email, accepted or not, has specific reasons for what happens to them, not a vague set of rules that nobody knows like Gmail has.