No, they both end up in the same thing. Raise number -> You are better at things.
Quite, but what drew it to my attention was in my early orc warrior days.
I was in mainly steel armour and happened across iron bracers offering +15% 2H damage. Awesome I though to myself, I use 2H weapons. I'll just check and see what protection I'm trading (steel > iron) for the increase in damage.
And I couldn't find it. Short of going out and getting hit for a while/hitting things for a while I could not, in any meaningful way, ascertain what I was losing and what I was gaining. In the end I rolled with the iron and did trial and error - but if that is the intention, then just remove ratings and change the wording to "makes you do more damage" as opposed to "increases X by Y value/percent" because it is currently meaningless, it has no context.
Making informed decisions with half the data is impossible.
Illusion and perks I've already discussed but this goes double for an irrevocable thing like spending a perk.
The values either matter, or the do not - this current halfway house makes NO sense and personally, I find it confusing and obstructive [when I stop to think about it, which for the reasons above, I try not to].
Edit: Actually given the abject lack of reference data and some manner of units, it could just as easily be lowering the numbers makes you better, we really don't know without trial and error (and some things are one time use/spend perks being the most obvious example)