Platinum, and to a lesser extent palladium, tends to lack the deep blacks that are fairly easy to produce with silver gelatin, and trivial to produce with inkjet media.
Personally I think that this is only problematic in three circumstances:
- The print is displayed next to another one which has very much deeper blacks. This tends to leave the platinum/palladium print looking washed out.
- You have a client who demands deep blacks.
- Your subject and composition demands deep blacks.
The first is usually easy to avoid, and the second is only relevant if you’re making prints for other people. That leaves the third, which is wholly subjective.
In my opinion, the starting point for any artistic media should be its natural characteristics. In other words, don’t use watercolours if you want the look of oils. (Although having said that, the whole multi-coating and gum-over topic is fascinating, and I applaud people like Bob and David who are/were working on this. Pushing the boundaries is always interesting.)
Platinum, platinum/palladium and palladium prints can be exquisite, even with a relatively low Dmax. There are some things you can do to boost your blacks but they’re hard work and it’s easy to get carried away chasing something that can be very elusive.
Learn to love your medium; everything else will follow.