Perhaps because any information they give out is likely to be twisted and they risk people getting at their throats for a couple of reasons?
Anyway, I doubt that a simple "We are working on it" would really satisfy you. In the end it's a matter of whether you trust Firaxis to fix and improve their software or not. If you do, then official statements are not necessary for you, because they are just stating the obvious. If you don't, then official statements are unlikely to satisfy you, because why should you believe in them? (I've seen developers promising patches and then leaving their fans with a half-assed effort that barely fixed anything, happened not long ago.)
I trust Firaxis, based in my previous experience with them. That's why I bought the game on release. If I don't trust a company, I'd never buy a game from them for full price without playing a demo first.