
maintainability
Some features are unfortunately unrealistic of getting implemented. For example, attempt to develop a hardened kernel. It's stalled. Unfortunately, contributor unfortunately.
Related development philosophy and goals, most related:
More:
There problem is there is "no Open Source business model", see Open Source Business Models. At least, the founder of the Kicksecure project did not figure out yet how to generate a stable income stream that can support multiple (or at least 2 o 3) full time developers. Kicksecure is not alone with that. Many Open Source projects have the same issue.
For example, departing from Debian stable and maintaining custom (hardened) kernel is certainly more than the founder of the Kicksecure project is currently considering maintainable. Maintainability is considered a necessity. There is a long list of of security, privacy and/or anonymity focused operating systems which haven't been updated in a long time, can be considered abandoned, deprecated.
- Liberté Linux
- Anonym.OS
- Subgraph OS
This of course also goes for Linux distributions with different focuses. There is a long list of Linux distributions and when reading through many of them, it is easy to see that many are discontinued already.
The Tails project has opinionated on the topic of Linux distribution maintainability in a similar way. Their write-up is recommended to read.
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Many, many Live system projects — including a few ones that aimed at enhancing their users' privacy — have lived fast and died young. We explain this by their being one wo/man efforts, as well as design decisions that made their maintenance much too costly timewise and energywise.

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