I have two bikes with Ultegra Di2. My Giant has compact gearing with 11x34 rear, and I use every gear when climbing/descending in the hills of the BlueRidge. There are some very steep sections with not a lot of room for error. I pray my chain doesn’t snap (I did snap my loose bottom bracket one time and it damaged the chain stay. It was an expensive repair......
Frame creaks and all, quite an adventure!
This is a genuine pressure test for a bicycle.
__________________
Ride hard and ride on......