Fair, I shouldn’t be commenting anymore on Fyne before I hear them. But this experience with Tannoys most likely carries over: when you buy these, get a pair of spare tweeters for your Fyne and stash them away safely for peace of mind.
I hadn’t read complains of Tannoys failing either, but I’ve definitely witnessed degraded tweeter performance: once on my Kensington SE, and once on a friend’s Dimension TD10. Upon discussing it more with my dealer "oh yeah, that can happen". It was a rather subtle distortion in nature, and only one tweeter was affected each time. Didn’t wait around to see if it would get worse; just replaced them and they were at peak performance afterwards. Didn’t happen again. The cost of the replacement tweeters should be reasonable. I'm guessing the Fynes will be more akin to the Tannoy tulip tweeters, which include the waveguide and magnet in their assembly (alnico Tannoys tweeters are just the 2" metal diaphragm, voice coil, and plastic end cap).

