One example is authoring USDT probes. This is done by writing inline assembly comments [1] that the kernel can then trace when instructed to.

Also people doing cryptography things occasionally need access to specific ASM instructions for their work. I believe AES has specialized instructions, but there are more cases.

You're not wrong that writing inline ASM is a fairly specialized need, but for those who require it this will come in incredibly useful.

[1]: I still need to try using this, so I might be wrong. I was waiting on inline assembly to be available before trying tho, so quite excited it's now available.