This is my point too.
When you place a room temp sapphire insert into a banger which is already at dabbing temp, that is a much greater degree of thermal shock than what comes from the heater coil warming up from room temp over a few mins to dabbing temp. The sapphire is going to heat up much more gradually in the scenario with the electronic heater coil, which does not itself reach dabbing temp for a few minutes, let alone get all of that heat into the rest of the titanium and sapphire.
But this has me thinking man, if you really want to find out about this, perhaps I could run a smaller experiment myself first and let you know what happens in my case.
I own a bunch of d-nail sapphire inserts. I could quite easily torch my v1 flat titanium nail to dabbing temp and then drop it in and see how it goes a few times. I can afford to damage one of those inserts in the event that it is no good
I'll let you know of my findings bro
EDIT:
Ok I gave this a try and actually, I was successful:
http://www.d-nail.com/d-nail-v1-flat-titanium-nail
This is the nail that I used, on a d-nail slim series base. I placed this configuration on an old mini rig of mine and torched the titanium nail until it was much hotter to hold my wrist over the top of it than what my 30mm liger would be. I then waited for it to cool down until the temp felt appropriate to my wrist which I held roughly 1 inch above the nail to sense temp.
I had my .07g dab of distillate already on a d-nail v1 sapphire insert and ready for insertion. When the nail was at temp, I gently placed it in by hand. The vaporization started reasonably quickly and was very full. Major clouds - no damage to the sapphire either! I think I may have placed my sapphire insert in there at a slightly higher than ideal temp still, could have benefited from 5-10 seconds more cooldown IMO.
A few notes:
1. The d-nail sapphire insert is much lighter in weight than the liger inserts. Dropping a liger insert into an already hot dish is going to involve a larger item falling into a deeper receptacle. We must consider that there will be greater shock from the drop itself, especially given the greater weight. This combined with the thermal shock may make for different, potentially disastrous results on the liger.
2. I really liked this approach for torch dabbing. I won't be giving up on e-nails any time soon for this, but I'll be sure to use this approach in the future when I don't have electricity! The titanium gets to temp more quickly than SiC torch nails, and the flavor on this sapphire insert torch dab even at a slightly high temp was as good, if slightly better than my SiC torch dabs which I always use at lower temps.
Getting the insert back out after the nail had cooled down was a PITA, definitely need to be able to remove the insert warm. I wonder if wood might serve as the best material to hot drop a used insert out of a hot nail?
Conclusion:
This 'torch, then drop a sapphire insert with preloaded dab onto a hot torch nail' (forgive me, I am not in the right state of mind for naming things creatively!) technique appears not to necessarily lead to breakage for isolated or less frequent usage from my experiment. I will start doing this regularly for a week or two and report back on how the sapphire lasts after continued use in this way