I don't really care how a company arrange their PCBs. It's just like writing code, as long as the code is correct, easily readable, expressive and have great eventual performance, it's a good code, you don't have to keep your lines in a visually beautiful perfect symmetry to achieve that.

The same is true for PCB design: as long as the board is correct, reasonable, stable and have good performance, it's a good board.

Based on the video, in order to clean up the dirty fans in this machine (something you'll start to do eventually), you'll have to:

1. Un-glue the button rubble stand ring to access the body screws,

2. Remove the exposed power supply (Risk getting shocked or worse),

3. Detach almost everything (screws, tapes and cables) you can see, so you can un-mount the main board to access the fans.

Then, after done cleaning, you have to do everything again but in reverse.

My opinion is, Apple can make their circuits look like a Steve Jobs thonk pose, but if an user has to go through all that many trouble and risks to preform such simple and (rare but) routine task, this design is bad.