This is very dumb. If I switch to new outlook, I get copilot but I lose access to team inboxes that I use daily. Those are only available in the old outlook. So I guess i'm stuck with the old outlook without copilot available because I cannot lose access to my team inboxes.
We are stuck in this very odd and frustrating position - that Microsoft is making "New Outlook" available and still supporting "Classic Outlook" until 2029. During that time, "New Outlook" will continue to receive updates and some feature-alignment with "Classic Outlook" - but in the interim, we are stuck with the feature/function variance between the new and classic versions. I'm completely understanding your frustration, and share the same concern. We will likely be left in this situation for several years - or until New Outlook features align with the Classic (at Microsoft's discretion).
Best advice I can offer, is to follow this link to track the upcoming features that are coming to Outlook: Microsoft 365 Roadmap | Microsoft 365