My spouse and I have a total of three accounts, which are all linked to the main family account holder. One is our shared personal account, and we each have our own work LastPass accounts because some of that information is sensitive and so usernames and passwords would be illegal to have in a shared location. But it would be very nice to be able to be "signed in" to both the personal account and my work account on my devices (similar to how we can on Amazon, MyChart, etc.).
I'm hoping that if there are enough people who would use this, then LastPass would be incentivized to develop/program it.