You can’t have everything at once and the Agenda team have not been kicking back and doing nothing since when this feature was first requested.
Although the share extension feature has not been released yet, a HUGE pile of other features have been released and a whole list of new features are going to be released soon. I’m not going to list every feature or call out what’s coming, do your homework and check recent updates from the team.
It’s all about prioritisation. I personally would love a password feature to stop prying eyes BEFORE share extension, but you won’t see me complaining why it’s not here yet.