I get what you are saying but I think it is maybe a little extreme. The 105 GT temp is an approximate temp and the GT temp is where it only begins to soften. I think the odds of gravity deforming the first layers of a print on a flat surface are probably extremely small. With that said, using a lower temp is certainly is not a bad idea.

Quote Originally Posted by Sebastian Finke View Post
The defaults are set like that for beginners who struggle getting prints to stick on the build plate.

The physical property I mean in this case is the glass transition temperature of ABS which happens to be 105°C. At this point ABS can be easily deformed by gravity. Your HBP should be no higher than 100°C.