As for Germany [...] I am sure they have plenty of money to burn
I really do not intent to come off as mean, but if it wasn't so said, that might actually be funny.
Haven't you at all seen the reports over the past few months how, to simply properly equip one or two bataillon sized NRF / VHJTF / national MilEvacOp units, required to basicly rob the complete remaing Bundeswehr of night vision, nav and comms gear? Not to mention the massive maintenance backlog in infrastructure. Or the rather low number in flight hours for aricrew.
Investing in and establishing a complete new capability is really too much here.
... and if Spain, Italy and France owns one, I am sure Germany could find a reason as well.
I actually do think in a properly constructed, expanded military strategy, there can be a place for such a vessel.
Maybe even more so as a NATO asset for moving military contingents via sea, or the german proposed, european ASW helicopter squadron. Although when regarding assets as large as LHDs, I believe that sharing & pooling idea is at it's limits.