If you tell a kid he can have ice cream in an hour and then don't give him ice cream for a few weeks, that kid is gonna be rightfully upset.
More like:
Dad, can I have chocolate ice cream?
Sure son.
30 minutes later: Son, I've decided that cookie dough ice cream is good enough. There's no need for chocolate. So how about some cookie dough ice cream instead?
OK Dad, sounds good. Not as good as chocolate. But it's still ice cream.
Next day: Son, you remember that cookie dough ice cream I promised you? Well, the cookie dough factory is down for refurbishing. So if you still want cookie dough, it's going to be a few weeks. But if you want Chocolate Chip, I can get it to you in three days.
OK Dad. I really just want some ice cream. So whatever gets it sooner.
One week later: Son, remember that chocolate chip ice cream we talked about? Yeah, so the chocolate chip supplier had an issue with his shipment of cacao beans, and well, the ice cream manufacturer doesn't have any chocolate chips. But I think I might be able to get you cookie dough by Friday?
Dad, I thought you said the cookie dough factory was down?
It was son, it was, but I think they must have found some cookie dough stock somewhere. So it's looking good.
OK Dad.
Two days later: Dad, when am I getting my ice cream?
Dad: Blank
Son: You said the end of the week. What does Blank mean?
Dad: Blank
Son: OK, so am I ever getting ice cream?
Dad: Blank.
Daughter: Dad, can I get some ice cream?
Dad: Sure daughter! In fact, you can have it today!
Daughter: But Dad, it's 9:00 PM and we have no ice cream in the house. The stores are closed. How are you going to get me ice cream today?
Dad: I told you, Daughter, since your request is new, you can get it today!
Son: But wait, I asked you for ice cream three weeks ago?
Dad: Son, don't you remember what I told you about the chocolate chips?