MOB Gear -- Are Dan Buoys and Life Rings Still Relevant?

[Dockhead]

I'm doing a complete review of all my safety gear for my upcoming Arctic cruise.

We will be servicing all the automatic inflatable life jackets. Everyone will have drysuits and AIS MOB beacons. We will do a lot of MOB training -- I think we will even try an actual person in the water drill (calm weather and with the dinghy standing by).

Now I'm looking at my two life rings with lights and dan buoy -- and wondering if this old junk is still relevant at all?

Maybe the dan buoy should be changed for one of the much taller inflatable ones with lifting sling integrated? Or maybe it doesn't matter since all the life jackets have lifting straps in them.

And life rings -- do they actually do anything useful in this day and age?

Anyone have any views on up to date approaches to all this?