As we like to say: it's all about tradeoffs.
I have an uneasy peace with my furler. I came to them after years of delay when Donald Street went to furlers. His line (from memory) was: "No, it doesn't always work. Do your hanks and sail slides always work?" I had to admit that mine didn't.
Anyhow, on failure modes. Another failure mode is the failure of the furling line itself, either by chafe, or coming uncleated. If this happens with the sail furled, in a high wind, the sail will quickly unfurl to its full size, with probably catastrophic results. So the tradeoff is that you (should) expend a lot of care on the furling line.
Whether because the halyard jams or the furler line parts, I've read with some skepticism of people sailing in circles to wind the jib around a non-turning furler. But I guess if you're desperate.... The furler foil (around the headstay) is usually in multiple segments, joined together. It is possible (happened to me) for the slider (attached to the head of the sail and to the halyard) to hang up on one of the joints in the foil, so I couldn't lower the sail until that was fixed, which required going up the forestay.
I have a furler on my jib, but not on my staysail, because I want the option of mounting a storm staysail on the staysail stay, and haven't seen an option to do that on the market that persuades me. So that means we furl the staysail the old way. It's all about tradeoffs.
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