Programs like GZCLP and 5/3/1 and back work

Recently switched from the recommended beginner routine to GZCLP and loving it.

1. Why in the mentioned programs it is specifically the back work that is moved to Tier 3 (in GZCLP) and accessory work (in 531)? In other beginner programs pull ups and barbell rows for example are on par with the other main lifts, with, say, 3x5 sets of them. Is it because of anatomy? Is it because it's not a competition lift?
2. In GZCLP it's barbell rows and lat pull downs with high reps (T3). Why pull downs and not pull ups? Is the only reason is that it is not possible to have enough reps/volume with pull ups?
3. I feel like for me pull ups are more favourable than pull downs, and I fear like the carry over from the latter to the former won't be as big. I currently max rep at 8 pull ups. What are my options? Replace pull downs with pull ups, and try to do many (say 10) sets of 5 reps throughout the day, to reach the same rep count? Or is it better to stick with the pull downs for a couple of weeks, then when getting stronger at it move it up from T3 to T2 (3x10, 3x8, 3x6 reps)?

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