I had a couple ideas for new machines…
“super” hunters. IMO hunters are the scariest machines in the game and could be way scarier if they were 2 or 3 times as big and just as fast. Even better if they were heavily armed and armored and could shoot while they run.
some kind of largish centipede - like machines with either legs or wheels that has a nasty main gun and multiple varying turrets along it’s back. With a machine like this it could have both size and speed.
My problem with the “tougher” machines already in game is they are SOOOO SLOW! They just aren’t all that scary even when you aren’t max level armed with experimentals. The reaper isn’t very scary.