How can Superior Customisation and Cortosis Weave be considered "attachments"?
It means that you can "attach" and "detach" them even without a Mechanics roll.
Shouldn't this type of "Attachments" be considered "Modification Options" of the basic item they modify?
(So you must roll to 'place" them and if you fail you can ruin the basic item)
I agree there is some logical failings, best not to think too hard about it. If you think too much then you have to ask yourself if special boots should be an armor attachment, or just a new piece of gear? Scopes can be yanked off a weapon in a second. Should that be an installed attachment, or a piece of gear that I can carry multiple versions of slapping one on my weapon that fits the situation best? Yep, best not to go there.
The game started with basic equipment which can be mofified using the current attachments, therefore allowing unique pieces of equipment for characters. We are now (as new sourcebooks release) seeing equipment with some things already built in. Who's to say we don't see something like a version of Mandalorian heavy armour that already incorporates the cortosis and superior qualities, and still has hard points for more customization, all with a comiserative cost? Doesn't mean that the attachments should change, though.
This is exactly what I'm afraid of and wish they hadn't done. You can already "make" that armor you just described by choosing Heavy Battle Armor and applying the Cortosis Weave and Superior Customization attachments. Making new, named armors could have been done so with the current system in place without the new armors over-shadowing what is in core.
I instead wish only new basic arms and armor made it to expansion books. The Bow, Slugthrower Carbine, Sniper Blaster Rifle, all without unique brand names. Then, the expansions could have had several new attachments and example brand named items with pre-installed attachments. For example, the Power Armor in the latest book could have been given a company name/model, then described as a Heavy Battle Armor with Strength Enhancing attachment with adjusted price and a note that 2 HP's have already been used up when purchasing it. Doing that doesn't make the core Heavy Battle Armor and attachment suddenly obsolete. A player with his cool Blaster Pistol modded with attachments that he is proud of piecing together may be heartbroken when the next expansion suddenly makes it a piece of obsolete crap, relatively speaking.