Quite a few people don't use korganizer. Nevertheless the 'Event reminder daemon' is started on login by default. This triggers an akonadi daemon start. (Verified on 2 Yakkety Systems that this prevent the autostart of akonadi)
IMHO, we should not trigger an unnecessary login delay and permanent resource allocation/consumption of akonadi as long as the user does not use it.
I'll suggest to turn off autostart of the ''Event reminder daemon'.
TODO: Check/Verify that if a user starts using korganizer, that
a) event daemon is set to autostart
b) user is asked if he want's to use the feature.
Even if it does not do a) or b) autostart off is the better default IMHO.