But there really is a huge unaddressed need.
The issue is rather modular design is supported. Can I design a fastener, nipple, flange, joint, or handle that can be used across (on the order of) a 100 design. If I can do this effectively then a small design shop can achieve (on the order of) a 10-fold improvement in productivity by investing in a domain specific parts library.
From '75 to '85 the software community transitioned to modular methodologies. The unaddressed need is analogous; in fact the analogy is quite strong. Copy and paste is not a substitute for subroutines, functions, or objects.
The proposed solution is a good workaround for a hobbiest with 2 or 3 designs, but it has the problem that it makes all the other designs that also linked to the same sub-part out of date. In this case what should I ask/require the human designer to do? Update the link in the other 99 designs? What if some designs don't want visibility turned on?
In other threads I've seen proposed solutions to similar problems, that amount to just don't use links, (e.g., breaking the links so that every part captures a historical snapshot of a widely used sub-part). This is a step backwards. If I discover subtle flaws in a widely used sub-part, the fix is unlikely to be widely propagated. If you have zero life-cycle obligations you may not care (all designs are historical snapshots, none of them are reused). But this is like being in the design documentation business, rather than in the design business ... sorry, shouldn't preach ...
Don't know if these links are stable, but no less than jeff.strater stated that AutoDesk would change all viability attributes to be "overrides" instead of design/part attributes.
https://forums.autodesk.com/t5/fusion-360-design-validate/toggle-visibility-of-parts-of-linked-compo...
This would be a huge step in the right direction. But the real unmet need is larger than that. We need linked sub-parts that support overriding a broad set of sub-part features, especially the parameters in the "change parameter" spreadsheet.