> Few truths are useful. Philosophy is generally impractical.
Modern philosophy is impractical. The Greek/Roman philosophy is great, for example. It should be a huge shame for "humanity" to drop this approach in favor of highly sophisticated word-juggling in three tomes.
> Premise 1: suffering is bad
As someone already mentioned in the post, there is the difference between negative feeling we feel and the process of suffering it triggers. One of the biggest flaws of the common human culture is the failure to recognise it.
You may feel the coldness of water, but not to be cold. You can feel pain but not suffer. Or, more generally, you can see a failure indicator on your control panel, but not to become the failure.
Without taking this difference into an account, the rest of this hedonism makes no sense :-)
On the other side, philosophers usually focus on abstract things: think/behave like this and your life will be good. Forgetting that whatever smart philosopher you are, you probably will not be able to function normally under extreme hunger or chronic pain.