pyramids

Hello I am new to the world of pyramids, ladder. I think I will do the ladders because they look better to me and I can go higher and do another one afterwards and I will have more volume than with a pyramid. Example: 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1 =...

Does anyone know what is the actual science behind high volume pyramid programs with a kettlebell that include both up and down pyramids and often start with 5 reps for the press? I don't really understand why you would not just warmup and then do a set to technical almost failure, not muscular...