I’ll put in my two-penny worth…
Putting on Rest at end of shift is unnecessary. BUT it does help persons who can’t cope with manual entries. It seems to prevent those situations where drivers show “Other Work” instead of Rest between 2 shifts, the most common mistake with digital tachos.
The proper thing to do is just eject your card when you finish with your vehicle. Next shift, put card in and do all your manual entries (which should include Work at end of last duty, Rest between duties, and Work since start of new duty).
On a Stoneridge it asks you if you’ve been “On Rest until now?” Yes/No. This again is designed to overcome mistakes with manual entries not being done properly. Easiest thing is just to hit “Yes” - but for the purists, it won’t log the time when you started work.