Interloper actually adds things to the game rather than remove them
I so often see people claim that they don't like to play Interloper difficulty because it takes away a lot of things from the game. Which is true, some items are unobtainable but very few of them don't have a substitution.
I would argue interloper actually adds things to the game compared to the other difficulties. Most notably the things you don't have to do on lower difficulties like carrying torches around, having to look for the hammer or hacksaw, having coal on you for warm fires, using magnifying lens to save matches, hunting for guts and hides, crafting clothes and the bow, using the forge, planning your trips to travel outside in the evenings, having hot teas for warmth.
All of these things are in the game on lower difficulties but let's be honest, you don't engage with them, beause you don't have to. There is no reason to use so many of the games mechanics because the game just doesn't require it. I would strongly urge those who were afraid to try interloper to do so. It will be difficult but it is a breath of fresh air when you realize the game can be so much more than tomato soup hoarder simulator.
Although I do agree that removal of some items takes away from the game and I would like to see guns in interloper. The easy way to do this would be to enable only empty casings to be found around the world and maybe up the gunpowder components spawns slightly. This would preserve the early game challenge and the forge runs interloper players love but would give the option for the gun enthusiast to find and use guns later if they wish with significant effort.