I feel your pain. I'm in the same boat. I'm hoping this is just some type of oversight and in the next iOS update they will offer an option to change a setting in Messages that will direct you to the Messages app when replying to a text rather than using the "quick reply" function.
The most annoying part about using the quick reply function - once you start typing a reply, if someone messages you before you're finished, it wipes out everything you had typed. REALLY annoying.
YEs, this is a major pain in the rear. At least in the app, the other person can see the dots if you are typing, but you can't on quick reply.
Apple just needs to buy Bite SMS and replace the stock messaging app. This might be enough for me to jailbreak again if anyone ever releases on for iOs 8/iPhone 6. That and the now even more comical 3x3 grid in folders.
The whole first world problems shtick just because it is something that has not affected you is getting so old, especially when the person saying that has a few thousand bucks worth of computers in their sig.
We live in the first world, so all of our problems are by definition, first world.