"The point of recommending some tailwheel flying is that it may educate pilots out of attempting to land too fast"
Why not just teach them to fly the correct airspeed? If you can't teach a PPL to fly a specific airspeed (plus or minus say 5kt) on final, then he (or the instructor) doesn't have a hope.
IO540
Tailwheel aeroplanes teach more than the importance of a correct approach speed. Far more important, IMHO, is that they teach a correctly held-off touchdown. If you fail to hold off enough, or hold off too high, do it too early or too late, you won't get away with it in a tailwheel machine - it is intolerant of sloppy technique. No matter how good your instructor, there is no finer teacher of landings than an aeroplane that demands correct technique. Every time.
In a nosewhweel aeroplane, you'll get away with quite appalling airmanship (within limits) - until the noseleg decides enough is enough. Then there will be another bent firewall, busted prop, bent panels, and shock-loaded engine.
SSD