The DLCs are expansions of the game which, should be independent of other maps. That is to say you shouldn’t have to purchase a DLC or travel to another map to obtain anything necessary to advance in another. If you disagree with this concept, take it up with WC. They have already changed the recipes for the kibble rework because initially they required ingredients only available on Extinction. Avoiding a “pay to win” scenario where players would be forced to purchase a DLC to make the new kibbles is the primary reason this recipe change took place.
There are a lot of things wrong with the new kibble system (like redundant time-sinking stews being included), but the biggest problem is with balancing. For example, it takes wyvern eggs to kibble tame a Griffin, but if a player has access to wyvern eggs they don’t need a Griffin , or at the very least, it is made obsolete. Additionally, a Giga should not be easier to obtain kibble for than a much weaker thyla or megalania.
As far as golden eggs vs. wyvern/drake eggs goes, there is a significant imbalance due to time.
Imagine, for instance, you could purchase something that reduces breeding times. Since breeding is mainly based on a time scale, players with the ability to make the purchase would have an unfair advantage over players without that purchasing power. This is relevant to golden eggs because they pose a massive time-sink in comparison to wyvern/drake eggs. While they are not difficult to obtain, doing so requires a ridiculous amount of time where nothing else can be accomplished. There is also a lack of a secondary use equal or greater than the kibble. Whereas obtaining wyvern and drake eggs are a part of normal gameplay, golden eggs are not used for anything other than kibble.
P.S. Golden eggs do offer a secondary use of a very slight and limited XP buff when fed to tamed creatures, but it in no way whatsoever is comparable to the primary benefit of wyvern and drake eggs that offer a chance to raise a powerful creature such as a wyvern or drake.
My response to any person that thinks wyvern and drake eggs are a viable alternative to golden eggs, is that those eggs should be removed from the extraordinary kibble list. Let’s see how many of these people defend the new recipe when the have to swim hesperornis to make them.