My company bills 1m a day through our online site, if my logins to our domain registrar were exposed then yes. .00001 is worth it, in the case someone would gain access and change our dns or do something else nefarious.
Like wise if my login to this site was disclosed, I can live with cleaning that up should it get out.
What shouldn't happen is the companies who were affected or the company who caused this (cloudflare) to say "no big deal"
At the very least they should say if you potentially used a serious service during this time and that service was using cloudflare then you might consider changing for reasons X,Y,Z.
Exactly. Evaluating risk levels and weighing tradeoffs accurately is taking security seriously. Overreacting to insanely unlikely scenarios is not.
If they misjudge that, it isn't an indication that they don't "take security seriously". It just means they made an error in judgment.
If it is say a financial company and the leak of data from your account alone could have massive repercussions on your company and/or investigations by the SEC and others...then yeah...if there is a 0.000001% chance someone out there has your login info, you change that right away. Or be found to be negligent and not change them, see how fast you wind up without a job/in court/fined/jailed. Just. Change. Your. Password.
It is possible for someone to take security seriously but not blindly value the tiniest bit of security over every other possible factor. Perhaps because they also take usability seriously.