OK. potentially got another one. Going to have to bear with me a bit to map this out.. otherwise, I don't think this "blindness" is obvious
in the Matrix section.
there is a write-up of commlinks under the devices section
also there is mention of cyberdeck in the same section - but the 2 devices are not described as needing to be grouped together.
the Personas and attributes section Describes ASDF, but does not indicate that as derived attributes A&S and D&F come from 2 different devices, or where ASDF come from (Eg. what devices provide these Attributes).
the cyberjack section does not indicate that this implant would replace the commlink, but I believe implied in the table on the next page showing the Attributes (D/F) for cyberjacks and commlinks
AR and DR is described using the Using the Matrix section - Distribute Edge - in that AR is Attack + Sleaze and DR is Data Processing and Firewall
The table on pg 177, lists different Cyberjacks, Commlinks and Cyberdecks that have an Attribute column. Cyberjacks and Commlinks have D/F, while Cyberdecks have A/S
the "Matrix Attribute Adjustments Example" on pg 178 seem to indicate that Attributes can be arranged in whatever order the player wants (eg. Erika MCD-6 has A/S listed as 4/3, so Attack could be 4 and Sleaze 3, or Attack 3, Sleaze 4 - depending on how you want to use it.. I think).
OK, to the point. The Blindness's, is IMO:
1) its never stated, but I think implied that you need both a commlink or cyberjack AND a cyberdeck to get the full Matrix Experience - but it's never said outright.
2) its never stated, but implied that your matrix attributes are changeable each time you enter the matrix, based on the attributes of your gear, and it never describes outright what gear provides what attribute
3) The table on page 177 lists attributes and abbreviates (D/F, and A/S), but does not actually explain this abbreviation or what this column means. it's implied but you do need to reference several sections to figure it out.
all in all. it took some serious page turning and cross referencing to (I think) understand how the "cyber" gear is supposed to fit together - but it sure feels like this is "obvious" knowledge that everyone playing SR knows

hence the blindness thought.
Cheers,
J.