So, the Exchange mail issue is still persistent in iOS 13.2.3, hopefully 13.3 which should be released this week corrects this issue, for the time being switching to Microsoft Outlook on iOS has been my work around for this issue.
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Its one of a few issues that is important to me, Instagram not working correctly, Facebook not loading certain posts, a weaker camera experience on the Note 10 & Fold vs the 11 Pro Max (e.g. rapidly taking photos in succession on the Note 10 there is a delay when pressing the shutter vs instantly working on the 11 Pro Max, way softer shots, no way to turn off beauty mode), WAY poorer voice support on the Galaxy Watch Active 2, poor bluetooth connections between the Galaxy Buds and the Note 10 (until the recent firmware update), poor search in the native Samsung email application, poorer switching with Galaxy Buds and phone and watch vs iPhone, poorer car integration experience (CarPlay vs Android Auto)
Again with the above said I still pickup the Fold and Note 10 and love them for different reasons (fit and finish, screen on the Note 10, screen size on the Fold) but when I am working and go out day-to-day its the 11 Pro Max that goes with me.