Using Classic Outlook on Windows for personal email, calendar, and contact management
I guess "Acceptable" depends on who you're asking. Based on OPs initial concern, this reasonably seems like it covers it, and was helpful/sufficient for my needs.
Obviously not your fault but that solution has been proposed multiple times over the past few years as a solution which is likely why it's rejections are becoming more abrupt.
Not trying to be argumentative - I'm genuinely curious - what is a workflow that makes this method wholly unusable?
If you think of outlook as a dashboard monitoring multiple categories (in folders) then it's not acceptable to only be able to read each item on a dashboard at a time by interacting with it. The point of a dashboard is that it gives you a wide sect of information at a glance.
If I recall correctly, you could never get total number of items in each folder to persistently display in the folder pane, only at the bottom for the selected item, so why is hovering to get that info significantly different?
It wasn't on by default but in the old outlook there was an option to toggle between the unread emails in a folder and the total emails displaying on the side bar. For workflows like inbox zero, seeing the total is much more helpful than the unread mails.
My workaround has been changing the emails to not switch to read status when I click on them but it's imperfect because they go read if I open them in a new window.