At least half of the twisty bulbs I’ve used, get a toasty brown base when they die, and many smoke or fill the area with a burnt odor.
I wonder if a dirty little secret is that they are not rated past 120 volts. When it’s common today to get household voltages up to 130 in newer neighborhoods where the power distribution has been upgraded for all the McMansions that were expected.
I have had some toasty brown bases too. Couldn't really put a percentage on it. Haven't had any break.