improve calendar experience in SharePoint Online.
Two things would make calendars better in SharePoint Online:
Allow exchange calendars to be displayed in the My Calendar web part on SharePoint pages.
Allow SharePoint calendars/lists to be email-enabled in SharePoint Online.
Both of these are available with SP on-prem, but apparently it taxes the server too much to be available in SPO.
Lisa J commented
#2 is a big loss for me in moving to SPO -- I *hate* having to go and create another calendar entry all the time. It was efficient to invite the team calendar to meetings that I wanted to appear in the SP calendar.
3. We need to be able to overlay an Exchange Online calendar in SharePoint Online