Blizzard please reconsider your stance on both of these mechanics. I will try to be as brief as possible while attempting to stress how important it is to alter or remove both of these mechanics
For those of you that don’t know about leeway, what it is, and how it works, here is a quick description: To assist melee in hitting moving targets the melee’s attack range is extended while moving, and while the melee and enemy are standing still the attack range shrinks to the normal size. This was to compensate for bad internet, bad PCs, and is something that is no longer needed today.
An excellent example that goes into much greater detail:
This has been beaten to death and I realize that so let me just state that layering is going to kill the herbalism and alchemy economy if it lasts more than a week. The amount of black lotus, dreamfoil, and other herbs people will be able to farm with the help of guildies layer hopping and inviting them will mean they will be set for the entirety of classic for flasking every raid. My solution would be to only use layering/sharding for levels 1-10, of if that’s not feasible, layering for the first week.