That is ludicrous! Melting IS associated with heat. Do you know there are molecular-sized things going on inside an LED? The diode junction is but a few molecular layers thick. It can melt without any obvious damage when observed by eye.
LED lights are poorly designed, like most everything else from China. All it takes is for the LED die to be mounted on its heat sink with an insufficient amount of heat conductive glue. It is also possible to compound that glue incorrectly so that it doesn't conduct heat well enough to keep the junction cool. The heat sink itself can be undersized or not positioned properly to get airflow to take the heat away. The airflow in the fixture can be restricted so the airflow isn't fast enough. Before you give me a song and dance about airflow, we are talking convection cooling.
That was a brain fart. I meant melting isn’t burning out.
LED lights are FINE. Your sockets on the other hand... I’ve got an exterior LED light (sealed, only way to replace the bulb is to buy a whole new unit) on the south facing side of my house, in Tucson. If LED lights had a melting problem I’d have to replace that thing multiple times a summer. Never replaced it. I have unreplaceable LED lights in the kitchen. Never replaced. I’ve never replaced a single LED. Sealed or bulb. EVER. I work in the computer industry, I’ve got 25 year old equipment with rows and rows of LEDs, never had one stop working.
If you’re replacing your LEDs all the time you’re buying crap products, or putting them in crap sockets. PERIOD.