I'll give you my use case. I have 3 profiles, personal, scouts and fencing association. Each of these profiles syncs with its own Sync Profile (email), because they are all used on different computers, some of which are not mine and use the institution email for syncing.
The personal profile use my personal mail, and has various container tabs as needed.
The scouts profile use the scouts email for syncing, share with my fellow scouts.
The fencing association I manage syncs with my personal email in the association's domain, and it has 3 containers: association-personal (for my files and email in google workplace), association-admin (for managing the whole workplace) and backup (recovery email for the workplace and for some other external services before workplace).
With containers only the sync will not work, and also I will be nagged to "switch to this container" everytime I open a google-related page, which I use with 5 different accounts.
Profiles and containers fit perfectly my use case.
The personal profile use my personal mail, and has various container tabs as needed.
The scouts profile use the scouts email for syncing, share with my fellow scouts.
The fencing association I manage syncs with my personal email in the association's domain, and it has 3 containers: association-personal (for my files and email in google workplace), association-admin (for managing the whole workplace) and backup (recovery email for the workplace and for some other external services before workplace).
With containers only the sync will not work, and also I will be nagged to "switch to this container" everytime I open a google-related page, which I use with 5 different accounts. Profiles and containers fit perfectly my use case.