If your databases rely on a Domino server, your FT indexing of attachments will work. On local replicas only the index over the Notes documents will work.
And to the perspective thing: You're right. The majority of people is using server based applications and so they won't have any trouble with indexing local files. But on the other hand taking databases and files to a notebook for example is one of the strengths of Notes. There are a lot of people travelling around and working with their applications offline.
Some are using 3G or EDGE or whatever to connect from the outside which makes searching on server replicas a lot slower.
I really hope that the dev team will fix it in 8.5.1 ;-)
Feedback response number TLAG7JBAG6 created by Thomas Lang on 09/09/2008