Are Windows and Linux insecure? They don't have anything like SIP. Also, the whole idea of SIP has a strong https://xkcd.com/1200/ vibe.
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It's worth noting that macOS without SIP is a bit more permissive than Windows—it allows you to load unsigned kernel extensions, for instance, whereas 64bit Windows will not load unsigned drivers†.
But I generally agree—power users should feel fine disabling SIP.
Windows has Windows Resource Protection (previously known as Windows File Protection) with same goals as SIP.
SELinux for Linux can achieve similar levels of protection.
Windows Resource Protection doesn't prevent code injection, and can be disabled from within the OS. I don't consider them equivalent.