Equipment-restricted stats?

So, recently, I noticed certain equipment doesn't seem to come with a certain stat. (Typically a %). For example, jewelry (rings, amulets) can't seem to have Strength %, Armors can't have Agility %, and Shoes can't seem to have Dexterity % as a stat from what I've noticed so far.

I did not find any information about such restrictions anywhere, so I'm wondering if there is a certain resource which covers this topic. As I'm not sure if I'm messing something up or if this is legit; furthermore, it would be nice if there was a list of stats which a given equipment is unable to have.

Thanks in advance.

Thanks!

Quote from Skarsburning

Go run through this Vicegerent - https://gladiatus.gamerz-bg.com/items. Will be useful

Sure has updated a lot since I've last went through it, props.

Quote from Sheogorath

Just to clarify, I'll add that it applies to negative percentages as well

It can be a way to make certain scrolls better by negating their % decrease in a stat

This is very useful info as well, thanks. Maybe I'll give those prefixes/suffixes with negative bonuses a chance in the future x)