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> DOS never had an option to shut down, you just saved your work and turned off the computer.

I miss this simplicity. With journaled filesystems, it should be pretty safe to do this.

Few things bother me as much as a computer that takes more than 1500ms to shut down.

Many modern embedded operating systems support this (including some Linux distributions and Windows IoT). It’s possible, just not very practical, most wouldn’t consider the necessary trade offs worth it.

If you boot Windows from a RAMdrive you can do this.

Paraphrasing: If you boot <OS> in a way that it will never save data, you can do this.

AIUI there can still be write caches on SSDs etc

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