>>76525862 (OP)
>spend weeks working with the bar + a few kgs
No, it's designed to have a long startup in order to force buy-in, it's a marketing tactic
Of the LP's, Bill Starr's 5x5 in The Strongest Shall Survive is the original and best, for reasons that the other 5x5s which copied his failed to understand
>ramping sets instead of sets across
>same three lifts every workout instead of adding more
>move to HLM quickly instead of grinding every session
>ab work for warmup
>power cleans instead of deadlifts
The book includes both details on how to perform the lifts, as well as various substitute lifts and ways to use them, and even solid nutritional advice that still stands today
Starr was literally the source of the original 5x5 program. Everybody else who uses 5 reps in their programs says they chose 5 "because everyone else does it / everyone knows that just works". Starr actually tells you why he chose to use sets of 5, and when it's appropriate to use different rep counts too.
Absolutely top tier book, which is why it's so expensive now, but you can find a pdf for the low low price of free if you look