This is definitely something that's needed.
I just unlocked the blade runners despite already having the jetpack, making their "discovery" somewhat underwhelming. I could use their "fall" protection with the jet pack, but the game says "no, can't have that".
The gas mask, with the change to filter durability, now makes a lot more sense... yet I still struggle to use it because more often than not the terrain I need to traverse will be very uneven - thus I opt to take some damage and just fly with the jetpack rather than use the mask.
All of these 3 items should be useable at the same time. Legs, head, back - these should be separate, equippable, slots.