Ken, your example proves three things:
1. your skills, which is never in doubt
2. You can write copperplate with a fountain pen, if you can write copperplate with a straight holder
3. Even at XXXF, a fountain pen nib will never get the kind of hairlines you will get with a medium dip nib.
I remember a former conversation in which you asserted that you're not a huge fan of the infinitesimal hairlines that some strive for. You prefer a line that shows up well, and is clear. A fountain pen seems well suited for this style.
It also shows that the master makes the tool work, the tool does not make the master.
I'm sure Richard treasured that letter. It's a shame he doesn't really do the work anymore. I guess everyone gets to retire at some point.