There's alot of different kind of muscle builds on people and how there body response to stimuli for instance my lifting partner can go 415 on bench and crank out 8 to 10 reps then when we drop set to 225lb he can get 15 reps where as I can't throw up the 415 for as many reps as he can but I can bust out alot more reps then him after drop setting to 225 so it's all about what gives you results if you think going to failure works for you and your getting the results you are looking for then go for it.