Agree. I'd like to have the possibility to change some to each account - color or label or icon. Because we can not manage yet comfortably those without trying.
I would like to be able to assign different colours to accounts in the message pane, similar to the function offered in old Thunderbird versions by the extension "Account Colors" by DW-dev.
Yes, this will be useful. I've stayed at an earlier version of Thunderbird just to have Account Colors, which does not work with the latest versions of Thunderbird.