Think about what it actually held together. It marked the end of the workday. It was the reason to go out and the reason to stay in. It was how you handled the phone call you were dreading and how you got through your in-laws at Christmas. It was there at every celebration and every bad night, which means almost nothing significant has happened to you in years without it present in some form.
And it was social currency. Whole friendships were built on it — not on shared interests but on shared use, and those people are largely gone now or cannot be around you. That is a substantial portion of your address book, removed in a matter of weeks.
The personality part is the one that frightens people most. If you were shy and it made you easy in a room, or anxious and it made you steady, or flat and it made you funny — then the sober version arriving in its place looks like a downgrade, and there is a real fear that this is the actual you and the interesting one was borrowed.
Then there is the grief, which almost nobody admits to. You miss it. Not just the effect — the ritual, the reliability, the fact that it never once failed to do what it said it would do. Saying you are grieving a substance sounds like a warning sign to everyone around you, so most people say nothing and grieve it privately.
And if you are in church, you have likely been handed the verse about being a new creation. You believe it in principle. What you cannot reconcile is that the new creation appears to have no preferences, no plans for Friday, and no idea what it enjoys.