People often ignore the original purpose of Raiderio.
With the current state of the game where boosting is so rampant and being insanely overgeared is the norm, people have opted to start filtering others inorder to get healthy groups.
This has gone to the extreme side of things and probably something must be done about it, and imo blizzard has to fix the source of why we need raiderio instead of removing it, putting something else instead of it or just keeping it.
The reasons can be summed to pretty much
1- People are too attached to their keys
2- People dislike having to carry.
3- Having not good players in your group will turn it into a fiesta
4- Depleting is not fun
5- People leave at the slightest hint of a wallblock
6- People are abundant in numbers
7- People overgear the content heavily
8- There is no way ( before rio ) to know if someone knows tactics
9- The line between a competent player and an incompetent player has become blurry
10 - People not fit for the content apply for it without training / trying to learn
11- Some people expect to be boosted.
12- Once the key starts, your key is held hostage by the 4 other members in the run
13- People want to skip to the good parts
14- People want better players to smooth out their experience
15- People don’t want to waste time
16- People don’t want to bother with teaching someone something they should have learned before
17- Better geared players tend to overlook mistakes as they simply don’t care since they’re too strong for the content anyway
18- Struggling to finish content doesn’t feel rewarding
19- Depleting a key takes a big part of the reward
20- Depleting a key makes you feel like your entire time spent was lost
And plenty more other reasons.
Imo, blizzard should look at the sources of these, fix these sources and only then will we not need raiderio or any system of the like.