I've never been clear about something, at least about "standard practice" when it comes to effect returns and reverb.
Let's say a delay bus in place, as well as a few types of reverb.
Now I know it's standard practice to use reverb buses as common reverb for multiple tracks. But what about when you're also using, for example, delay buses in the same way?
Let's say you have a synth track with a reverb send. You also have a delay send on the track. You're sending the dry signal to the reverb and the delay buses separately. So the signal to the delay bus is going to end up without reverb on it. You want this delayed signal to sound like it's in the same space as the source track, so you make a send from the delay bus to the same reverb bus you used for the source track. At least this is what I do.
But what happens when the source track has multiple reverb sends? You might be sending a little to a room reverb and a little to a hall reverb. The delay send, however, goes to a delay bus which may be used by other tracks. You could make the same two reverb sends from the delay track, but what if this is not what you want for the other tracks using it? Is this when it's time to forget about shared delay sends and either create a delay bus that's exclusively for that track, or just insert individual instance of the delay on the track itself without using sends? Not sure how other people approach this.