harry potter - Once made, why would anybody need access to their own Horcruxes?

I understand why other people might want to get their hands on someones Horcrux, but once the bad guy/gal has split his/her soul and a piece of it has been interned into whatever vessel that was chosen to be the Horcrux, why was there a need for the person that created it to be able to retrieve it?

Answer

As far as we know, you don't physically need the Horcrux object in your possession to resurrect yourself (at-least not with the method which Voldemort and Wormtail used in Goblet of Fire).

Note: don't confuse the Diary as a physical means of re-incarnation; as I understand it, it was the 'memory' part which was doing the resurrecting (using Ginny's life-force) and not the Horcrux part¹.

Let's look at it from Voldemort's point-of-view (since his is the only one we know of - Herpo's details are quite obscure and won't really help us here).

How do I know they are ok?
Voldemort needed to check-up on his Horcruxes once he found out that the trio was after them. I believe this is the primary reason to have them accessible.

Kill two birds with one stone
Some of his Horcruxes had more purpose than just tethering his soul to this world, showing his cunning by not wasting an opportunity to make use of these hard-gotten devices:

• Diary: Had his memories instilled in it which was designed to entrap and ensnare any unsuspecting readers.


• Locket: Had a powerful curse which would cause the possessor's mind to get corrupted, designed to perhaps cause dissension among his enemies (maybe even confuse someone enough to walk straight to Voldemort?)



• Nagini: Very powerful snake, able to communicate with and do Voldemort's bidding, mobile so V could keep her close at hand.


• Peverell/Gaunt Ring: Extremely powerful curse placed upon it; touch it and you die fiend!


• Quirell: Questionable (Quirell was a quasi/temporary Horcrux), but similar to Nagini, he was used to perform Voldemort's bidding.

I see you're on my Horcruxes' tail, let me just put it over here now
Another reason to be able to access your Horcruxes is to be able to move them if need be. Lets say you catch wind of someone being on your Horxruxes' tail; if you cannot access them, then you have no chance of grabbing them and moving them to another place.

In summary; It doesn't seem like it is essential to access your Horcruxes after you have made them, although you may see fit to check-up on them, or change their location if you see that someone is on their tail.

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^{1. Correct me if i'm wrong; but that is what I understand from this: https://scifi.stackexchange.com/a/27492/21267}