Why contacts needed to get Buds transparency?

[andxblink]

Using my new Buds 3 for the first time, I was prompted to enable sharing all contacts with Samsung. 

Why? 

[Eϙᴜɪɴᴏx]

If you want to start a call over Buds3 using Voice Control, so the Buds need to know, who do you wann to talk with.

[andxblink]

I dont need that