As noted, confirm how you created your boot media, and make sure when you have UEFI enabled, you also have USB options enabled / showing.
What motherboard do you have?
AFAIK Enabling legacy boot would only "hide" the UEFI boot options if they were disabled. Some BIOS (like some Dells) may have EFI network boot, USB boot, etc turned off when you switch from Legacy to UEFI. You have to go in and turn them on.
I feel like this thread is a goof, but I do find it amazing that we still encounter problems with text entry speeds in the year of our lord twenty twenty four. I was typing on a Kaypro suitcase-style computer back in the '80s, and it was better...
It's interesting that he still purely builds locally, though I guess not overly surprising especially when you want to wring out every possible second.