Just wondering where you two get your ideas?
How is a racing multihull inherently less safe than a racing monohull. ... When most of the racing multihulls have issues, it is usually with them capsizing
...but at least the crew usually has something to wait for rescue on.
Well, you have answered yourself
We are not talking about cruising multihulls, but of dedicated big ocean racing boats. Boats with a a huge rig and big sails.
Modern top pure racing ocean monohulls, boats (like Open60s), don't sink when capsized, or at least stay afloat for several days, sometimes weeks (it has happened many times).
And when the boat goes turtle, if the keel stays in place, she will not stay capsized.
YouTube - Spirit of Canada Rollover Test
On the other hand an ORMA class trimaran ( Big Ocean racers) will only need wind to be capsized. No breaking waves, just wind. A lot of it (70K), but it has already happened, on a relatively recent Transat where almost half the multihull fleet capsized. I have read the interview with one of the skippers that said they had all sails down, but that the force of the wind on the mast was enough to capsize the boat.
These are not very usual circumstances but it is usual to have capsized multihulls on an Transat, not to mention a circumnavigation. The boats are racing, pushed to the limit...and sometimes they go over the limit...and that means a capsize. And if that capsize occurs at 30k, with a good probability you will not have only a capsize, but also a broken boat.
When a monohull goes over the limit...it broaches, or go to 90º capsize and easily get back on their feet.
I get these ideas for following attentively, for many years, ocean racing at its top level (monohulls and multihulls). The simple observation of all those races show that the accidents (not only capsizes, but also broken boats) with multihulls are much more frequent, even if, as I have said, the number of those accidents on multihulls is decreasing.