I have used mine both ways, by preheating the oven, and by not preheating the oven, when baking things like cake. I find no difference in the finished product, except time needed to bake completely, and I just judge that by inserting a toothpick until it comes out clean.
This is just my experience, but I'm wondering if the cracking and breaking in the oven isn't caused more by two other occurrences.
First, stoneware cannot soak in water through the unglazed portions on the bottom of the piece, because overtime, it will cause crazing and cracking. Therefor, I don't soak my TT, and I wash it very quickly by hand (no dishwasher) dry it and let it sit a day or two before I use it in the oven again. In my opinion, even the amount of water splashed around the dishwasher might be too much exposure and is soaking in to the unglazed portions.
Second, much of what is displayed on Facebook are pictures of lid its and bakers that don't have complete coverage of the ceramic surface with food or liquid. For example, if you put a chicken in a 9x13 to roast, but don't put liquid or plenty of food in the bottom of the dish, you are baking it "dry". The same with baking or roasting on a lit it. Lots of surface where no food or liquid contacting the ceramic. Most ceramic manufacturers tell you in their literature not to put the piece in the oven dry, and to be sure there is plenty of liquid to cover the bottom of the pan. Polish stoneware stressed this process in their presentations and directions sent with the dishes. I don't think ceramic can handle the stress of this dry heat, and that is why so many lid its crack.
Just some observations from my years of use, and reading the instructions from many manufacturers. Hope it is of some help.