Can someone explain to me what the fascination with old goal ovens is?

We get new ovens or recipes for both the 5 and 15 day goals. As near as I can tell, the only way opening up old ovens/goal ovens would benefit anyone, in any way, is if they had every. single. basic, special, and goal oven mastered well before the next goal. Since we continue to get new ones every two to three weeks, which usually aren?t even completed by the next goal, we have more then enough recipes to keep the coins and gems coming.

So I?m truly curious...what am I missing?