In regards to the topic: “AI” integration is not as infeasible as it might sound. UEFI can load files from disk just fine, a variant of FAT32 is prescribed for the ESP, other filesystems can be supported at manufacturer’s leisure. So, it wouldn't need to fit into the limited flash chips. Even in DIY mainboards, they might use eMMC or whatever other technology they deem suitable and cost effective for such bulk storage.
Then, people may not be aware that bootloaders and boot managers, Microsoft's as well as, say, GRUB, Syslinux, rEFInd or systemd-boot, are usually ordinary executable files these days, in a fashion similar to Windows' EXE files. There's even a standard for some basic shell. The UEFI will fetch those, then they will be executed in the environment it provides.
There's a number of system services available, including (generally) facilities to get keyboard input, output graphics and similar affairs. There's a need for those in any case, to make the UEFI UI work, so they've sensibly been made available for the next stages to use.
This means that, if “AI assistants“ were deemed worthwhile to include, they could be launched in much the same fashion, and they'd (presumably) have full hardware access, entailing RAM and all the capabilities of the GPU and NPU to do AI. Drivers are needed, but other than that, it's not that much different from having them run as program within your OS, only a bit more cumbersome to do. (P.S.: When you're testing with too little RAM or maybe a low-end CPU that doesn't have enough grunt to provide responses in a reasonable frame of time, it might just be disabled or refuse to start and tell you about the lack of resources. Not a problem to me.)
Would I use it myself? Likely not, I should have the necessary knowledge by now. There's the risk manufacturers will care even less about menu layout and such, when most users—those who even bother to enter UEFI UI—won't be seeing those at all anymore. Though, on the flipside, this could provide a sliver of hope, just a wee tiny one, that manufacturers might dare to yet again provide a bit more of those “technical settings” even on prebuilds, laptops and such, when they’re reasonably sure buyers won’t get scared by that anymore.