[chevill]

>How many mistakes does someone have to make before we start to suspect there might be problems with relying on that person's work.

There's a lot of legitimate criticisms about modern OS security, whether we're talking about Linux/Android, MacOS/IOS, or Windows. However, we can't ignore the scope of these programs. Supposedly Windows 10 is approximately 50 million lines of code and due to its overwhelming popularity it has almost certainly been targeted more often than all of the other OS's listed combined. I am pretty sure all of these operating systems are > 10 million lines of code.

Whose work are you going to rely on instead? The level of security in these OS's isn't equal across the board, but I assure you zero days exist for all of them and barring some kind of miraculous technological breakthrough, they'll continue to pop-up from time to time as long as they exist.

Suppose someone pulled off a miracle by making a security-focused OS that's easy for non-technical people to install and use and actually gains enough traction to establish a market share. If such a thing existed it would likely get lots of things right where others have failed, but they would also likely get lots of things wrong. It doesn't mean we shouldn't try and it doesn't mean we shouldn't encourage both old and new companies to try and improve the situation, it just means that its an incredibly difficult and likely never-ending task. Security is a process, not an achievement.

[failuser]

Does it need to be 50 million lines of code? When you design with security in mind you might have to prune old code and drop some risky optimizations, probably drop some features. Using a higher-level language might help reduce the line count as well at the cost of performance and memory consumption.

[chevill]

>Does it need to be 50 million lines of code?

Probably not and they should try to reduce the size if it makes sense. However, if all of the OS's I listed are above 10 million lines even in the best case scenario a modern operating system isn't going to be anything less than an overwhelmingly large and complex program.