Monday, 25th April 2016, 02:41 by HardboiledGargoyle
I think a lot of it just has to do with how it's been set up.
There are a lot of sources of rF/rC/rN. They are common body armor egos. They are found on rings, so non-artefact rings alone can give 2 (and sometimes more) pips. Some sources give multiple pips, including some unrands and some non-artefacts. Some things give rC- and/or rF-, meaning you're encouraged to counteract it with multiple pips from other sources. There are some places where you want to stack rF (zot 5), rC (cocytus), and rN (all of extended), and I suppose stacking stuff can be fun, but this "resistance-check" system also seems to work well with just 1 pip - just look at the Slime Pits.
Single pip resists are more rare. Resist corrosion wasn't found on rings until recently. rPois can be found on many items, but at least items can't give you poison vulnerability, and a lot of rPois's function has to do with negating status effects.
Standardizing the value of resists with each other sounds nice. More manageable for players in places like Zot and Elf. There's a lot of "at least 1 pip" nonsense here and there, which would naturally be removed if there was only 1 pip, and an additional "immunity" level. Some of the more subtle rules related to resistances are more tolerable when there's only one level of resistance, less so when you can have rN+ and rN++ and rN+++.
If you want to curb the max number of pips, you probably want to remove rF/rC/rN from the list of standard armor and ring egos (although rPois demonstrates to us that it's not necessary) and limit the number of rF/rC/rN pips to 1 on any single piece of equipment. I'm not sure about rN. There are effectively two pips of rTorment. Maybe they could be merged into rN somehow. Maybe rN could be more continuous, like MR or AC, scale with XL, etc.