This is apparently not reccomended on bigger turbos, why exactly is this? Excuse my ignorance!

I have heard that bigger turbos W/O DV's are more prone to early failure, does the bigger turbo generate more force when it stalls, is the shaft design on a T4 the same as a smaller turbo? Or simply because the larger turbo is running at higher performance level so the shock load on the bearings is greater when it stalls?

Although I am keen to hear from people who have run a T4 for a long time without a DV and have had no issues, this does not really answer the question in a technical manner. Cheers!