Using New Outlook on Windows for personal email, calendar, and contact management
Unfortunately, Microsoft won't listen to users. They sound sympathetic but really don't care and probably have no intention of restoring some features from Classic to New Outlook no matter how many people complain. There's got to be reasons for it. Back in Oct 2023, their response to someone was:
"Please understand since the New Outlook is on preview stage, some features may not supported/feasible, our product team is still updating more features on it and move features from classic Outlook to the New Outlook, and you can submit your feedback via the in-app support Help-->feedback from your new outlook."
How difficult can it be to restore the export/import feature? I could be wrong, but I believe there may be a reason they removed this feature in New Outlook for example. Possibly to stop people moving and storing their emails elsewhere as they want to be able to force people to purchase more storage.