It is as you put it, a suggestion. A QT doesn't have to be an expensive endeavor. I feel being newer to the hobby and adding something that wasn't QT'd properly which could potentially kill his first fish might discourage him more than the slight cost of a QT. But to each there own. If you had read the whole thread you'd have noticed he's in the process of setting up a 55 gal, is it not worth it to QT additions for that as well? In your expert opinion whats the appropriate size of system to start worrying about QT? Ultimately it's up to him, I'm just suggesting a safe route to atleast research and look into for him to weigh the benefits of it for himself. Instead of the dip and pray method you're suggesting. Atleast if he researchs QT methods whether he decideds to set one up or not he is familiar with what's needed to do so. So when he does introduce something unwanted he could be prepared to handle it much quicker (Which he would need a QT for anyway).