You guys already named them in rice and boldin.Care to name a couple of those 4.7 WRs that "torched the league"?
If you have to dig deep for legendary slow receivers like Biletnikoff or Largent, I'd observe (1) the speed of the game has increased since those guys played and (2) even in their own times they were exceptions that proved the rule.
Successful 4.7 WRs are rare in the game today. The only such player that I can think of off hand is the guy I alluded to earlier as a tough-as-nails possession receiver...Anquan Boldin...who ran 4.71 at the Combine and looks about that fast on the field. But he just gets open, has hands, and takes on defenders. Again, he's an exception that proves the rule.
Now, would I rather have a 4.25 Hayward-Bay with bad hands and little utility beyond vertical routes that don't fool anybody or the 4.71 Boldin? The obvious answer is Boldin. But that's with 20/20 hindsight.
When projecting college players, it is nearly impossible to look at a 4.7 guy and say he'll have a Boldin-type career because so few have ever materialized.
4.7 is on the extreme end but obviously it shows players can still excell in spite of being a bit slower than others.
Hayward beys college career did nothing for me, so a 1st round pick at the time seemed ridiculous no matter how fast he was