The best replacement depends on what kind of pain you are trying to remove. Some people want one browser hub that keeps many accounts and apps together. Others want stronger separation, where websites behave more like dedicated desktop apps with their own boundaries.
At a minimum, the tool should make account identity obvious, reduce the need to log in and out, and help you group related work without making the whole day feel like one long browser session. Good notification control, predictable switching, and clear session separation matter more than sheer feature count.