A password manager is a single point of failure and should be avoided. I've heard other sad stories about someone who's pw manager was compromised and they lost everything.
out of curiosity - what scheme do you suggest? I've always been of the mind that 'one thing to remember and secure, but secure it well' was the best option - 2factor and a 15+character passphrase meaning that nearly everything else gets it's own discretized blast radius.
I think the bigger problem is using your pw manager for 2FA too.