I think the community mindset on this filters down from speedrunning. If players aren't even willing to tolerate dice rolls on critical hits because they ruin their 'perfect run', how well do you think RNG procs go down?

I really enjoy RNG-based procs, personally, especially if you give players situational tools to help fish for those procs. Heavensward's DRK was a great example of this. But the playerbase needs a different mindset if we want to see these back.