One caveat to diceware I never liked is how it wears out the keyboard over time as you have to type the same passphrase each time to open the vault (You would be surprised how many times I need to do this each day). I sometimes have to lock my database to avoid evil maid attacks when in a hotel for example. Of course I go through about three keyboards a year because of this, but I don't mind the cost if it gives me a crispy fresh keyboard each time. And did I mention I don't own merely one encrypted database, but many depending on different contexts and different devices?
This is also something I see quite often on mobile phones with a pin/pattern unlock: you can often infer the pin from the wear pattern, or the grease marks on the screen if the phone was used recently.
My keycap wear pattern more or less mirrors the letter frequency in the languages I write.