We had an experience some time ago with an old dinghy we were using. Anchored the Yacht, rowed ashore for a run, let a lot of air out of the dink. On return from the run, the dink was limp on the beach. At first I thought it was someone playing tricks, until we noticed the end of the pontoon had blown out !
Since then we had been using hard shelled dighies, but now we have another inflatable
and want to avoid a repeat.
Pressure relief valves just seem like common sense for inflatables. I noticed some dinghies for sale
made here in Oz, have PR Valves fitted as standard (glued in). So the notion is out there.