I have to say your fisrt reply followed the book.
This last fall I sailed from Alameda CA to Honolulu HI.
And have some comments on what is needed for safety.
1.) the liferaft will only work when the ocean is calm
(In a storm it would only work if it was packed full
so you can't move much or you are the only one in there)
otherwise the people would beat each other to death! (I really mean this)
2.) The EPIRB is highly recomended (it avoids the elec system)
3.) The SSB is a joke in my opinion for safety.
(Just ask any sailor who has one, what percentage of the time there is Usable propagation)
4.) life jackets and teathers ARE important.
5.) Ask yourself is the Vessel prepaired
(sails = OK, wind vane = in shape, Engine starts well, ask to look at the most recent survey)
6.) Can the Captain can single hand the vessel across the bay (5 miles +/-)
7.) The crew has a good set of Foulies, Boots and is in good physical condition.
8.) Have an energancy plan (loss of rudder, loss of engine (solar, wind power), leak, medical, etc.
Lastly I had a crew member who required the SSB and the liferaft on our trip (I did add them for him)
But did they add to the safety (NO!) but they did add entertainment, on the SSB, and the one crew
needed the comfort of the Lift raft even if it was not real.
I also had Radar, GPSx4, VHFx2, Flash lightsx6, storm sails, etc.
If you want to read about the adventure across.
I would also stay away from those with only book experance they are well ??able.
Best of luck and Fair winds.
P.S. compatability is REEL IMPORTANT on long voyages.
PPS only two item must be true on a voyage
1.the boat must stay floating.
2.the salt water must stay out of the boat.