Having your passwords quickly available on every computer, every phone, every OS, and every browser is great. Browser-plugin + app password managers do all 4, while password managers provided by the OS or browser typically fail at one of those. They fail hard, too, by making it difficult to manually extract passwords when you need to. They also tend to lack features like password generation, note storage, etc. It's a completely different experience, really.
And — at least on iOS — is glacially slow. Startup times of twenty seconds weren't the rule, but not uncommon, when I tried Lockwise last week. Even at the best of times startup took five seconds at least.
