Greetings, I am currently running Strength I and while Strength is my main priority i have implemented shoulder and bicep work following the volume landmarks proposed by Mike Israetel, coming from a decently high athletic base( i religiously practice Jiu jitsu 3-5 times a week, mostly 8-10 hours away from a training sessions) it does not seems to affect overall recovery for the main lifts.
Is there a good reason to not implement this kind of hypertrophy training while pursuing maximal strength and proficiency in the “big 3”? My reasoning is that the poorly leveraged muscles like side delts and biceps do not significantly impact progression or performance in the powerlifting movements, is this true? Or do they come at the expense of the body using resources that could have been used to create adaptations on the tissues relevant to the sport of powerlifting?
Regarding the volume landmarks purposed by Mike Israetel relating to hypertrophy, are they good and demonstrably true or just arbitrary numbers that have no evidence behind them?
Pursuing hypertrophy in a significant way on muscles such as the biceps and side/rear delts is a goal that significantly detracts from the goal of excellence relating to powerlifting, the ideia the it comes with the expense of the body adapting in a manner that is not specific to the sport is true? Or the impact of is minor, given the limited use of such muscles on the movements relevant to the sport?