This is an interesting way to tackle the issue, I like the thought you put into it. For the record though, I like the multiple pack types too.
The reason to take them away on this set was so that we didn't have the same issues on the last set where people complained that pack type was better than other pack types. Part of this was because things were new. Next set should not be new, and thus it should be much easier to add in more pack types AND/OR even do what you suggestions with Advanced Potions.
Thanks for sharing Astack and good ideas!!!