Well, not the OS, per se, but macos updating mechanisms have auto-restart path, and I imagine any Linux update that touches the kernel can be configured in that

Well, not the OS, per se, but macos updating mechanisms have auto-restart path, and I imagine any Linux update that touches the kernel can be configured in that way too. It's more the admin's decision then OS's but on all common systems auto-restart is part of the menu too.