There is no point in quibbling over the differences in the meaning of "should". Just stop.
Answering Steve Chamberlin's q, "Why aren't PLB's a more popular choice? It seems the discussion is usually between carrying a Spot (or DeLorme InReach) or nothing":
Because leaving bread crumbs tells family and friends (and SAR if necessary) that you are moving and ok, and gives a last known location. LKL would have saved a few $100K in the search for Larry Conn, and lots of anguish for family and friends. A lone hiker with a PLB who has a sudden accident as Likely probably did cannot use a PLB. Sat phone doesn't help a SAR if one is incapacitated, either. Bread crumbs are the most effective tool in that situation. If not incapacitated, then any of those tools would work.
In Likely's case, IF he had been using a bread crumbs feature, rescue or recovery would have been completed in less than 24 hours.
