l had an idea regarding the machines. With the third game, it is expected for new machines to appear. At least hopefully so.
It is known that after HEPHAESTUS was exposed to Zenith's printer matrix, it was the data necessary to replicate the nanotech. So, what if it would create machines that are mixed with the said nanotech. And one (or multiple) of those machines would be equipped with a device that would interfere with the Focus, rendering Aloy (us) unable to scan it and somewhat become vulnerable since the weak points aren't revealed.
Another idea was that HEPHAESTUS would mix machines together, creating a sort of hybrids, ie. Thunderjaw x Slaughterspine, Tremortusk x SS, Stormbird x TJ/Dreadwing, Fireclaw x Scorcher.