There is a related section (in a way). It goes under the heading Categories.
I have to agree there are some shortcomings (which may have been addressed in later updates); but if you're looking for a particular App, just type it in the (Q) search box.
Otherwise I would agree it is probably safer but there again, if you have a problem with an App, the app's developer is the first port of call ... not Apple.
Not finding an app update in the mac appstore can be because the update is not yet cleared by apple for the appstore, OR the update is not available because the updated app is outside the specifications that apple has set for apps to be approved.
If you type the name of the app you want to see in the appstore search field you get a list of all related apps in the appstore and you can sort on relevance and other criteria.
ok so I have been looking for an article as to why one would want to use the mac app store as oppsoed to just finding what you want online.
You are correct that downloading from the App Store is safer. Apps in the App Store have been "cleared" by Apple, and they also have to abide by strict sandboxing restrictions (which limit what the apps are able to do). Although that's not a guarantee that an app couldn't do something sneaky, it certainly does limit the possibilities and makes it very unlikely that this would be a concern.
Because App Store apps are limited in capabilities, you may from time to time need to download something from a source outside the App Store. When you do, as long as the app is created by a developer who is registered with Apple, and the app is "code signed" by that developer using a certificate issued by Apple, then you will be able to open that app as well. (Unless you have changed your Gatekeeper settings to only allow App Store apps.) Such apps cannot be guaranteed to be safe, but if a developer is discovered to be distributing signed malware, Apple can simple revoke the developer's certificate and the app will no longer open.
By default, you will be prevented from opening apps that are not signed, which present the highest risks.
For more information on this sort of stuff, see my Mac Malware Guide.