Fatigue management is one variable. The more sets a total tonnage goal is exploded across the less fatigue will be generated.
5x5 @ 85% will be very challenging (about rpe 9), this will produce a lot of fatigue that has to eventually be dissipated.
There are ways to handle this, but you can produce less fatigue if you did something like 8x3 or even more sets with less reps per set (using the same weight at the same intensity of 85% you did in the 5x5) then you will produce way less fatigue because the effort needed to complete each set will be a lot lower.
There are other considerations too, if you train for strength sports then simply getting more sets in doing a movement with perfect technique where you are not grinding hard and forming bad habits in the majority of your working sets as a result of the effort needed to complete the set will absolutely be beneficial. You're basically getting more practice in this way, which is hugely beneficial for competition based sports.
I train for bodybuilding so I make ample use of high intensity techniques even on a high frequency setup, you just need to be realistic and pragmatic in it's application and it works nicely. But strength sports is a different beast entirely. Well, not really, but you get the idea. I'm a fan of waiting as long as possible before a lifter specializes training, which means most guys should be focusing on strength for a while before specifying training. The soviets had the same approach to specialization too when they were snatching medals like it was nothing.