While the factory plays fast and loose with threaded hardware that has excess thread,
( yes sometimes factored into stretch and yield ) it is usually best practice to have a close fitting shank bareing on the un threaded areas.
Especially when there is side loading involved.
If you look at NAS and AN hardware they are measured by shank not OAL.
When correctly tighened there should be no potential movement but if there is a close fitting shank near the joint keeps the hardware in shear , rather than a bending moment the loose fit does.
Is this critical in this situation ? Likey not but I feel best practice.
If in doubt, obviously the production hardware will be , well, at least sufficient for the task.
All the above just opinion, your mileage may vary
