When I archive a contact it keeps showing up (people on whatsapp at least if where i've seen this behaviour).

I assume that when I archive someone, even if i get interactions with them that are synched (whatsapp that i can tell of, not sure about others), the people keep reappearing, and I understand that this is basically what archive if for. Nor sure about the difference with Delete, not sure if Delete desynchs that contact, ir it will appear again if there's a contact in one of the synched channels (hint: it shouldn't).

For example, familly.. i don't want it to appear on Dex, so what is better, archive or delete? In any case, my point is it should not reappear.