There's a requirement to provide bulk metadata update functionality to the client. The solution suggested is to update Touch UI screen to provide the functionality to update metadata for document sin one go.
I know there's such functionality but it requires selection of one asset at a time. Client has more than 27k documents and not defined folder tolology. So the requirement is to update metadata in one go.
To maintain over time, for new assets, if there is some need, you could use a custom launcher, for example. But ideally I think, the end users shoudl maintain the metadata, before teh files enter AEM, and after they are in the system