you can launch with less chance of observation.
Not by much. The only point of a carrier is its mobility, which means that it can project airpower over great distances but slowly and at huge risk. Land-based aircraft such as the B-1, B-2, B-52, those Russian ones and any fighter/bomber with AAR support can launch from any of hundreds of airfields on this planet. Unfortunately for the navies of this world there are not many carriers about.