This thread is relevant again: after upgrading, Bitcoin Core no longer allows me to symlink the wallet.dat file. I have never before encountered any application that threats a symlink different than a real file, this is supposed to be handled on the file system level.
Having my wallet on a different location worked fine for as long as I've been using Bitcoin Core, and that way it's easier to include it in my backups.
My obvious question: is there any method to still have a wallet outside the data directory? I can't make a hard link, as it's a different physical disk.
Edit: I found a solution, see
here.