Yeah, all metal heatbreaks are more prone to jams, but as long as they are kept cool they should work... I've had my share of problems with heatcreep on all-metal hotends and every now and then the problem pops up, mostly with bowden systems. Actually yesterday I had this happening, a red PLA started printing bad on very small details so I added a filament oiler with a dab of olive oil and it the problem went away. The filament had probably sucked some moisture as I there was an occasional popping sound while printing so the proper fix would have been to dry the roll. But filament oiling can help, although it's bit messy and not sure if it weakens the part. According to this at least PLA shouldn't suffer: https://www.youtube.com/watch?v=yY7ZrVE8eks.