I don't know, I didn't play Doom back in the day, but I did play other '90s shooters and as a general rule none of them were resource management games. The difficulty usually arises from multitasking, reflexes, and precision. They're designed so that if you use your entire arsenal situationally you'll never run dry unless you have really poor aim. The resource you do have to manage, although indirectly, is your health, because in each level you can only recharge so much before death is inevitable. DUKE3D was an exception, where on most level it would let you recharge completely at the cost of standing in one place just holding down the use key continuously for one or two minutes.