You have to remember, they created FTB to help support their Feed The Beast maps. They then expanded it to things like MindCrack and DireWolf20 (and to a lesser extent Forge), and while doing so decided to SHARE the launcher with the public. This makes it easier for us to play maps like Feed The Beast, follow along with the MindCrack folks and DireWolf20 during their seasons on YouTube. Everything else is secondary in terms of what the launcher is meant to do and support.
And, I'm not naive...I know they are getting some benefit out of everyone downloading and using their launcher, but that's not what it was originally meant for (from what I've gathered).
We can still go download all the individual mods, and create our own modded worlds/servers. FTB doesn't have any ownership or exclusive rights to the individual mods. They are just taking the grunt work out of creating those mod-packs for us. There's nothing stopping anyone from manually creating their own mod-pack, except laziness: "Why should I do it when FTB is already doing it for us?". That's fine....but have a little patience. Don't bitch about who gets it first, or how long you have to wait for it. If you want it sooner, build it yourself! They are doing the work, and they are releasing it to the people they originally intended on supporting from the get go before they release it to the public. Not only is this their choice, but it also helps the community as a whole. It's a small group of trusted and experienced players that are familiar with the mods. Sure they get it first, but they also get a chance to play and TEST the launcher and pack before us....kind of an unofficial beta test. If there are any bugs that were overlooked, these folks can find them before Slow-&-the-gang release it to the public and get flooded with a wave of "BUGS???? WTF-over???!!!"
A few more days of waiting (and I doubt it will even take that long) won't kill any of us. If you really want to play 1.4.6 sooner, download the mods yourself, and start playing. When the update for FTB is released, you can still use it...just port over your saves folder. In the meantime, go create a life-sized creeper statue out of cardboard or something....it'll be fun.