Bandai used to put diecast in SHFs and it was not a good thing. Metal figures tend not to hold up over time and paint chips off the metal easily, so hopefully they never go back to that

I have the old SHF Eternal with dem metal feet. They're tight as hell and paint still holding up.

Not sure why they completely removed metal feet tho. I think the last one with metal feet was SHF Banana Baron who was an oddity since most the other Gaim figures had plastic feet. The metal feet helped their stability.

I don't see metal-built SHFs being a thing but a separate line would be cool. Kinda like Kiwami Tamashii but 1/12.

Tamashii Nations: "So, we're putting out everyone's favourite villain, Metal Build!"
The fans: "Yawn."
TN: "Oh, did we mention he comes with more Hazard Form eyepieces, and that cool Pirate weapon? So he's technically everyone's favourite physicst?"
The fans: "Why is my wallet suddenly £60 lighter?"