Yeah I do this. I also work in security.
>why reuse at all?
Because it's easy. There's many sites I create an account for once or twice and I never use again, mainly e-commerce. I don't care if someone logs in, at best they get an address and maybe a few card details. That's all practically public information.
>are you sure? I bet that that's not true
Yup, 100%. And even if a few get missed, anything super important has 2fa, on top of using semi-unique passwords that adhere to a format so I can guess them in <5 attempts if I don't have my password manager on hand. And I check them semi-frequently in haveibeenpwned.
>Just use a password manager.
I agree this is good advice in general but even with decently designed password managers, like dashlane and lastpass, people often don't like to use them for various reasons. My parents get confused by new software. I tell them "use a very strong password for google, amazon, ebay etc, and if any other site asks you for a password use a weaker one". If they used a password manager I guarantee they'd get overwhelmed when it comes to using it on different devices and give up, reverting to worse security than before.
Also in the end, people are astronomically more likely to fall for phishing emails than be the victim of a security breach from password re-use. Seriously the whole "use a password manager with a RNG upper/lower/symbol/number combination" trend is overhyped and honestly a distraction from more pressing security issues. Google estimated phishing victims are 400x more likely to have their accounts compromised than anything else[1]. And as someone who is currently dealing 90% with phishing attacks over any kind of password related incidents I'm very inclined to agree. If you're a public figure and therefore an actual individual target for motivated attackers then yes, use RNG passwords and a password manager with 2fa and only ever store the db on a memory stick which you keep on a chain around your neck, otherwise it's not really necessary.
[1] https://www.bleepingcomputer.com/news/security/google-ranks-...