Despite what others are saying, I've been using it for a couple years and it can work great if you're okay with the trade-offs.

Of the three (Integrity, Confidentiality, Availability) it has better availability than cloud storage which is what I care about. Even when the LessPass site is down, there's an IPFS version, mirrors, local cache, etc so it's basically always possible to derive any password.

At a user level, it's very impractical (and a slight risk) to always retype the master password at every single login screen. However, letting the local autofill save the password doesn't defeat the point of LessPass. Why? because, if you only use local storage, and you're traveling and your phone breaks, you're now locked out of every account. With LessPass, you're fine as soon as you get an internet connection.

There are a few caveats.

• There's no global 2factor. Loosing the master password means every site that doesn't have its own 2factor is instantly fully exposed.
• I do agree there are a few sites where the default options don't work because of the character restrictions. It's about 1.2% of websites in my experience, but they are painful exceptions. Basically you have to rely on memory to be able to pick those same settings again. I recently wish there was a unified dataset of which websites had password requirements, and then LessPass would auto check the necessary boxes when the website URL was pasted in. Maybe one day.
• Changing your master password requires changing every single website. If you don't, then it's impractical to remember what password was used for what site.