Upper/Lower TM - reason to split?

[Bliss]

Greetings!!

PLEASE KEEP YOUR QUESTIONS AS CONCISE AS POSSIBLE! I do not need your entire life and training history before you make your point or ask your question.
...
Thanks,

Andy Baker

The two versions of 4-day upper/lower splits in PP 3 (pp150-152) are organised just that, a day for lower, a day for upper (whether its (vol-vol--int-int) or (vol-int--vol-int) is another matter).

What is the reason to split lifts in such a way?

What is the reason to avoid a "staggered" program?

Like this or similar:

Bench intensity / Pull volume
Press volume / Squat intensity
---
Bench volume / Pull intensity
Press intensity / Squat volume


Thanks! Just wanting to understand more theory, but unable to find threads on this topic.

[Andy Baker (KSC)]

Do you want to go in and Squat heavy the day AFTER you deadlift heavy? Making things harder than they need to be.