I'm another who believes the bead is superfluous.
Hard focus on the target, even better, the lead edge of the target, not the barrel/bead, will give you better results once you have proper stance, mounting technique, gun fit and balance. Hand/eye coordination then takes over.
IF (and that's a big IF !) the gun "shoots where you look", given ample practice, you will eventually, at best, only subconsciously see your barrel and probably not the bead at all.
When the targets look as big as frisbees (and not like aspirins) you'll have a big advantage at scoring well.
There are times and situations to basically use all the different methods of establish lead or forward allowance. Sustained lead works very well at most Skeet stations, although it's not particularly useful at Station 1H, 7L or 8H&L. With the varying angles of Trap (and some of the subtle angles are very hard to discern) pull ahead or swing through is often easier to apply.
At Sporting Clay / 5-Stand, the varying angles, distances and presentations make sustained lead very hard to apply successfully without a tremendous amount of experience in seeing & "reading" the various types & paths of targets you will see over different terrains and backgrounds (whereas Skeet targets always [or should always !] cross the centre stake at the same height and speed. Likewise in game shooting, sustained lead is very difficult to apply ... waterfowl don't decoy the same way a pheasant may rise, etc.
Far better to learn good stance & mounting technique then modifying your gun to fit so it "shoots where you look" than to try and adjust your hold on target to compensate for a gun that
shoots almost a pattern high... or worse, low. Yes it can be done, but how consistently can you apply it ?
There are some very good books on gun fit & various shooting techniques ... Robert Churchill, Gene Hill, Bob Brister, Chris Batha are all very good among the generalists. For specific sports like Trap, Skeet, Sporting, many of those sports "greats" like Missildine, Braun, Ohye, Hartman, Mayes, Bender, Smith & Digweed have all published books, and/or DVD's or Videos. Sometimes they agree on certain things & methods, sometimes not, but one constant always seems to be gun fit. "She really comes up nice" or " I've got a nice figure 8 and can see perfectly
down the rib " IS NOT necessarily good gun fit ... it can sometimes be far from it !