I hear you exactly!
location data and its (potential) interchange is something that also still buffles me.
hunch being it would work mostly via GPS coordinates in a DT context, but not really via location explicit IPTC/EXIF fields. but really this is a (relevant) question to me, still…
as to ‘comments’, I hear you as well.
this was part of the whole reason for my (initially personal) mapping. and, would say, it´s a reason why its good to talk about this in the community, and make things explicit and more clear.
… I have come to the insight/conclusion that for something like ‘comments’ the EXIF(!) field of ‘user comments’ directly transports into DT´s ‘comments’ (properties pane).
this was a surprise. but a very useful info at the same time.
… particularly bec I am in a phase where I newly set up and define my workflows re. this. so, the insight + takeaway for me is to use this EXIF field in Bridge to bind comments between my photo workflow and my documents workflow in DT.
of course, this is not easily doable if the case is for someone to retrofit all of his/her large-scale photo sets – and workflows – ‘just’ for the sake of using it more efficiently with DT; … or in the case where this clashes w/ other relevant/outside protocols (handovers in other ‘swim lanes’ etc.)
(… but as we also talked a lot about ‘good ol’ and helpful tools: with something like PhotoStation from Extensis this retrofitting – swapping entries from one field to another – might be perfectly doable; plus, as always, ‘there might be a script(ing case) for that’…)
so, yeah – these kind questions/challenges, when combining standard photo workflows with the realities of DTs document-metadata handling is just what this is all about… 