There's several problems I see with this.
First off, it seems like people in this topic are requesting two different things. Some want to be able to hear clips that are part of the composition. Like the following-
John_H wrote:"To be able to time out effects in fusion to timeline audio cues would be great.
Others want to be able to hear audio from the timeline while in Fusion.
RandyOK wrote:+1 on this!
To be able to time out effects in fusion to timeline audio cues would be great.
With others, it's ambiguous which they want.
These two suggestions aren't the same the thing. The former is needed, the latter is a bandage to one problem caused by Fusion's poor implementation into Resolve.
If you have a title open in Fusion, you won't even see the footage below it never mind hear it. That's because Fusion doesn't really work on a timeline scale, it works at a clip scale just like all other compositing software
and that's fine. If audio from the timeline can be heard in Fusion then that's a bad thing because it means the compositions themselves would still
exist within the timeline.
The problem with compositions existing within in the timeline is that very complex compositions can be accidentally be deleted during editing. You can save a composition to the bin to prevent that from happening but that's just a copy and there's no relation to them. This means that if you have the same composition used multiple times in the project, changing one won't propagate changes to the others. All copies are that composition are completely separate.
A better solution would be to take inspiration from Adobe's Essential Graphics or SideFX Houdini and create a panel that allows Fusion compositions to expose controls (start/end keyframe, position, colors, etc) to the Edit page without converting the composition into a macro. Doing this would allow a master composition whose changes would propagate to others and it would allow a bunch of parameters of the composition to be changed and keyframed within the Edit page.