Certainly true, they are harder to find these days than the blade fuses, if you can't find a Honda shop or mail order.
I carry spares with me on the bike for emergencies. I've only actually had to use one of them once, though. Oxidized fuse clips caused heating and melting of the fuse metal near the end caps. But, that does not make glass fuses unreliable. Clean/polish the fuse clips once every 20 years and they work fine,too.
Of course, I can't speak toward your particular failures with fuses. But, I find it hard to believe modern manufacture is to blame. The vibration just isn't that bad on an SOHC4. And, the fuse wire mass is so small.. Metal fatigue? Seams so unlikely.
I truly hope you are happy with your mods, for whatever reason, even if whimsy. I just can't believe blame is necessarily placed on glass fuse reliability. Sorry.
Cheers,