I'm not sure how "security-minded" you are if you used a centralized, network-accessible password manager service in the first place.
Actual security minded folks keep their password vault on an air gapped machine they maintain full, physical control over.
The kind of people who use centralized, networked password managers are, by definition, those who prioritize convenience over security in the first place.
Sure, using something like LastPass is better than just saving all of your passwords in your browser, or just using one password everywhere.
Citing this as evidence someone is security-minded is like saying someone is environmentally conscious because they recycle aluminum cans, despite driving a Hummer H2 and burning the rest of their trash.
Is it better than nothing? Absolutely. Does it make them an environmentalist/security-conscious person on it's own? No. Does it make up for the other shortcomings in strategy? Nowhere remotely close.
It's a half-assed baby step for people who want to LARP as being serious about their goal (environmentalism or security), without the slightest ounce of inconvenience to their otherwise completely polluting/insecure habits.
Keep driving your H2 and telling yourself you're environmentally friendly.
Keep using your PMaaS (password manager as a service) and telling yourself you care about security.