Completely concur. New update is a long way from the Apple standard I've come to expect since I bought my first Mac. That was a while ago.
1) Bad auto-categorization.
2) The requirement to hand-jam corrections one by one to set proper categorizations.
3) The introduction of new graphics in the List view that are uninformative, don't match the categorization type (which would be useful), are apparently randomly similar across very different senders (why does The UnPopulist,a Substack on politics, and Sunday Afternoons, a hat store, have the same logo - a pair of suitcases?), take up way too much screen real estate on small screens.
4) Correct numbers of emails unread don't show in Mailboxes view even when you select List View rather than categories.
Come on Apple. You guys do this on a weekend?
Here's what you need:
1) bulk categorization, so I can read a day or two of emails in list view, select them, and categorize them correctly
2) either turn off the new logos to the left of the email preview, make them user selectable, or make them reflect categories in list view so I can skim for my priorities, my transactions, etc; right now they are a negative value add - they distract and make managing mail slower
3) Make list or category view a macro choice - not one that I need to address every time I go to a different mail box
4) have the number of unread mails visible for all categories
5) when you read in categories, and delete "an" email it actually deletes multiple emails - for many of my feeds I read and keep some, delete others... delete AN email is delete a SINGLE email, not a thread, or a set of emails from a common address...