For general suggestions, yes. But this is the official feedback for the FA, in which case it makes more sense to put them here.
While feedback and suggestions sometimes have a lot of overlap, they are two different things, and the best chance of people noticing it is an actual suggestion is to provide the feedback in the feedback thread, and add that you are planning to make a suggestion separately. (or ideally, make the suggestion first, in the suggestion thread, then link to it in your feedback.) Some of us will go back through recent suggestions more than once, to see if we have any more input, or just want to bump them back into people's attention. I doubt if anyone goes back through the feedback threads to see if there are suggestions in them that could use more love.
another advantage to starting your own suggestion thread is that you can track back to it more easily, by looking at threads you've started, instead of trying to find the specific posts the 11 page feedback thread where you (or someone else) made a suggestion.