If I didn't have my current education, I'm not sure I would be talking with providers about script issues. I would probably miss a bunch of them, and I would not have a clear idea about what's an issue and what's not. In some independent settings, the computer doesn't generate DUR messages.
Additionally, your license qualifies you to work in areas with even higher levels of responsibility. Either a board of pharmacy would have to start issuing different level licenses for pharmacists or they have to hold everyone to a fairly high standard when it comes to education. Despite being someone who, through no choice of my own, didn't complete a residency, I would support mandatory residency for pharmacists.
Addendum: I just wanted to point out that community pharmacists actually have a huge responsibility to their patients as the last line of defense between them and a bad script. They also have a lot of power to change therapy. I have definitely called about weird scripts and gone over labs (often susceptibility results) with providers to find better therapy options.
I think he is referring to the idea that RPH's did not have the level of education that we have to acquire now and were not having issues with being able to identify drug interactions/dosage issues/etc. Really the only benefit for the PharmD over the RPH is a better background knowledge for being able to describe the mechanism of what the issues exist, which is important, but knowing everything about warfarin does not inherently make me good at adjusting the dose based on the INR. Most of what we use comes from simple daily experience with it, ie the life-long learner concept. It was simply just put in place to make pharmacist more clinical, which is funny as most of my clinical knowledge (PK) came from experience as an intern in a hospital and from rotations.