Not the bead tantalum, but the glue they used or a coating that they applied to the capacitor after assembly that has corroded the board.
As to the wet tantalum capacitors, the ones with the glass seal are going to last forever, but the ones in a package with an epoxy or rubber seal are a lot cheaper. I had a fun year changing out a few thousand of those that failed as the seal degraded with age, thermal cycling and pressure changes. The spares in the store were also failing, and the first time I sent them back as failing capacitance and ESR limits, the inspector did a __VISUAL__ check and sent them back. The second time they went back sans leads. I did then request ( and got) a computer printout of everything in the stores computer, along with a quantity and location, of everything with the letters cap in it. Took me 3 months to read that pallet of phone books that came as a reply, and the incinerator was pretty busy with the used books as well. Stores loved me after that though, I think there are still orders trickling in still.......