Help me to understand why all youtubers suggest this structure.

https://preview.redd.it/6wrdlrhjdmbe1.jpg?width=3840&format=pjpg&auto=webp&s=ecb155dfe04a2890eef9ec462cda07a82f13470d

I have watched a lot of YouTubers and their templates. They often use a bottom pipe connection in their setups. For 10 factories it requires 60+60 pipes or 510 plates. However, a top connection requires 160+40 pipes or 460 plates. This makes the top connection faster to build and cheaper overall. I don’t understand why they prefer this choice