This is a really, really basic guide. More details would make it a lot more useful to people who don’t really know much about material selection. Right now it’s pretty dumbed down.
6063 is not “difficult” to machine. It may be slightly gummier than 6061, but it by no means is difficult.
If you’re going to differentiate between 6061 and 6063 you should probably mention that 6063 is roughly 25% weaker by yield strength.
The recommendation to pocket, but do the math is sort of at odds with the target audience. If someone reading this doesn’t know the difference between aluminum/steel alloys/tempers, they surely don’t know how to do FEA to ensure their pocketing will be safe.
I’m not aware of anyone who does extensive sheetmetal construction utilizing widespread steel sheet parts on their robot. Maybe one or two in a very high load situation, but I would be shocked if anyone has built even an entire subsystem structure out of sheet steel.
AGMA 11 refers to the tolerances on gear teeth, it has nothing to do with the quality or type of material.
It would be more helpful to explain why you brought up 12L14 and the differences between it and 1117 steel (for what it’s worth I would say both of these have extremely low relevance to FRC and 7075 Al would be a better choice than them in most scenarios).
You don’t explain why a team would even choose to use steel. Teams don’t fabricate versaplanetary gears so it’s not really relevant that they are steel. Things like high load shafts, ratchets+pawls, high impact/toughness/wear parts, etc, would be a much better example.
You briefly mention baltic birch, but not why it’s good for FRC use. There’s a big difference between crappy sheathing plywood that is ubiquitous at home depot and high quality baltic birch. This is worth pointing out.