Hi there,
I saw an issue posted on this in the Tracker, and it was pointed out that Platform Pagoda would be a better place to discuss it - since I don't see a related discussion here, I thought I'd start one.
Overall I like the look and function of the new Launcher (at least, I will once it has stabilized a bit), but I do have a very minor gripe with it opening to the Discover tab instead of to Modpacks. If my own experience is representative, the 99.9% use case in opening the launcher is to play a modpack that is already installed. I know it's only one extra click (as I said, very minor gripe), but a major tenet of UX design is to make the most common use cases easiest/shortest. I'd suggest then that the currently installed modpacks be returned to front & center.
My two cents,
--Zack