Don't hesitate to send the author an email, open a ticket or a PR to make sure they see this, it seems more appropriate than HN comments for this kind of things :-)
https://operating-system-in-1000-lines.vercel.app/en/17-outr...
I'm sure they know that those things were possible. Perhaps you could have done it instead?
They bothered to stop and suggest improvements here. That's enough work for them. They don't need to go elsewhere and do more, any more than you did.
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