Because they are irrelevant for the big picture.
Your argument is “it works for me”. That’s just a bad argument.
Main score showing on an alt doesn’t really mean much though. If I’d go into an instance on a DH tank, even at +7, the run would be a mess because I have no clue how to play a DH at all.
I wouldn’t take someone that has like no score on their alt just because they have high rio on their main on another role/class.
They are not. My community is RIO-free. And everyone can join. And still everyone can just use their own key. How do you think i get to +20 with rio on a non meta class (ok, it is now but for pugging resto druid is still better on those levels).
No, i am not even using rio. And my community also isnt.
Yes i know. But somehow it was an argument that it only shows on THAT char on THIS season. Being too simplistic information. While it is just showing experience. 
This is all irrelevant. What’s your argument for RIO again? Right, that you “see” in your groups that experience correlates with RIO rating. I am telling you that this is a bad argument, because you are seeing the reality shaped by the add-on. If the ratings were, say, invisible to everyone, you would see way more people with experience but without good ratings and vice versa, correlation would have been much weaker.
It is not irrelevant. People are putting themselves in this situation. Wanting to pug and applying for dungeons they have never done on that level. And then blame an experience log addon for not getting invited.
Everyone has so many alternatives and options. They do this to themselves. We talk difficult content here. And there is no trying possible with the keysystem.
And without rio they also would not get invited. Because armory is showing the same info. Without showing information of another (main) character even. Rio is actually helping them for showing more.
That’s why I say that Blizzard should change the armory.
When blizz change armory to rio-information, you get the same info. And people talk about getting discriminated again. The source of the information does not make people getting more invites. it is irrelevant.
Why is it so difficult for players to just use their own key? You can not get declined for your own keys. No 2 hours waiting in stormwind.
Am I talking Chinese here? I say that Blizzard should remove information on mythic+ runs from the armory. And perhaps rethink people’s interactions with the armory and make all such interactions private. If they want to have a personal rating, they should implement it in game by themselves.
Yeah. No pugging anymore. 
or go do a rotation at sim-stones. Or what are those dps things where you can try.
Of course there will be pugging.
Yes, testing out by those testing things for dps 
Doing a check with questions about the dungeons
This only comes from people wanting to get invited on content they have never done, not wanting to use own keys, not wanting to be social and join a community. They want free boosts.
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Yeah but the entry method for higher keys will be worse than rio.
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More likely by ilvl. Which is much better than some custom rating.
I don’t think so.
Ilvl means nothing in the current game.
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It damages the game less than RIO, that’s good enough.
There are people not able to do +10 with 475 and others do +30 with 475.
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You can get 470 farming 5 mask and never stepping into keys, or in raid.
Ilvl only works if the gearing way is 1 only, that way ilvl/gear reflect progress.
Now is not really possible.
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So what?
You think the “experience” measured by the add-on is much better? But it doesn’t measure real performance, it measures a version of performance in reality shaped by the add-on. The add-on introduces an error and that error snowballs.
I guess I should illustrate.
Let’s be generous and say that the error between real performance and the reflection of that performance on RIO is just 10% - as in, rejection or acceptance based on RIO rating are wrong in 10% of the cases. In reality the error is quite likely way higher, but OK, let’s accept that it is 10%.
So, a person goes onto a run and he is rejected / accepted with an error of 10%.
But wait - with the way RIO is applied, one run builds on previous runs and so in the second run, the error is already 19%. And on the third run, it is 27%. And on the 7th run the error is 54%.
Due to the way the runs build on top of each other, very soon what you have in RIO rating is just error. The signal has been lost.
Is ilvl bad? Sure. But the reality is that RIO is just as bad. It’s garbage.