It may not solve any issue (e.g. separate history) but I wouldn’t want to use a browser without multi-account containers on my work laptop anymore. Separating internal O365 things form customer O365 things saves real time every day. No more logout-select other account-login again. Separating private browsing from that is a nice bonus. Only drawback is the pain I feel while viewing my co-workers stuggle with all that pain without using multi-account containers. But they too will see the light one day!