I'm just talking about me, I produce everything in mono first for strong signals. Then during mixdown, I pan what tracks need to be in stereo for the master.
Interesting. Could you please elaborate a little on the "for strong signals" part, you mean to help become aware of the overall amount of frequency masking inside of the mix? I might have missed some benefit about mono, I am open to the idea. One possible benefit I can see about it, is that it allows you to work with/approach the mix from the perspective of the combination of the frequencies hitting each ear, meaning that if you want the ears as a union receive a certain stream of frequencies/information, the mono dimension is what enables mixing from that perspective. That perspective can also be useful during recording and mastering. Maybe a benefit of this would be that you have equal amount of frequency masking on both speakers and you get a better picture of the more overall amount of masking present in the recording/mix/master.
Overall mono mixing is a little against my overall mixing philosophy, one reason is that I try to achieve separation as early as possible and mono is reducing the awareness of the separation, bringing it in later could help reverse some of the separation I've created earlier in the process. Therefore, from that perspective it makes sense to use mono before you start working on the separation, which would then be extremely early in the overall process, like during the production/recording process, to help set the potential for the separation of the mix. So maybe it could work to use mono mixing as one of the first steps, like when you EQ tracks. Then once you have a clear sounding mix with not too much overall frequency masking, you switch over to stereo to resume to the second part of the work with separation, but now in stereo and at that point you don't return to mono, because mono has already served its purpose. Maybe that's good, might try it to see how well it works.
The idea of delaying the switch from mono to stereo towards the post-mix/master, is interesting overall, but I'm at this point thinking that this switch should happen as soon as possible, not as late as possible, but I could be wrong, need to think through the implications of this...