The world runs on Unix and as a consequence, computer viruses, malware, spyware and ransomware are all common vocabulary terms. We traded this security away for nothing.

Linus Torvalds would have told you its system call performance, but Linux is also forced to solve these problems with things like futexes and io_uring, which carry over just as easily to microkernels.

Nowadays the excuse is side-channel attacks make any attempts at security pointless anyways so the kernel has exploded in size and complexity. This is insane logic, not least of all because side-channel attacks are read-only and can’t embed themselves into your system permanently through a bug in a browser JIT.

Linux is used purely because of all of its drivers and familiarity. Not on technical merits.