FWIW:
Here in Colorado Springs (dry climate, high altitude) I seem to have MUCH fewer cap failures than everyone else. I can't remember the last time I found a tantalum that was actually bad (and certainly not shorted). I have NEVER seen an exploded Rifa cap.
I *occasionally* find a dried-out electrolytic (especially in ordinary commercial radios and such), and some old paper coupling caps turn out to be a bit leaky in commercial gear (but almost never in higher-standard gear like HP test equipment).
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I *assume* that the dry air and/or high altitude is the difference.
I have NEVER felt the need to pre-emptively replace caps, like so many folks seem to think is essential. One of my 1960's-vintage HP machines had two examples of dried-out electrolytics of a specific brand/type, so I did replace a couple more of the same type that were in it (even though they were still working).
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Pete
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saipan59 (Pete)