Quick updates also decrease the likelyhood that there will come a point in time when you say "damn, we really need the new version of XYZ, let's just compile it and install it ourselves...", which involves problems of its own: you now have to monitor security updates for those system components yourself, rather than simply running the package manager to pick up security updates. It's a tradeoff, and I think Ubuntu handles it fairly well: you can either get the regularly updated ones, or the long term releases.