I feel like you're taking this to seriously... I never said disc was the best at 5 man mythics (Frankly i have no clue regarding the current "meta".)
I'm saying i was skeptical of the spec originally in 5 mans and was pleasantly surprised when it preformed as well as it did. I've now done somewhere close to 20+ mythics, and can safely blame all healing related deaths to my poor play and not the spec. Mind you when the group goes full derp and stands in breath on Helya people die.
This mindset people have about disc is really silly. Perhaps it is the worst 5 man healer (Once again i really don't know) but to say it's not viable for these entry level mythics is an exaggeration.
to troll you're wrong. I created this account after lurking forever on this forum and the priest wow forums (which are terrible btw...) My only goal was to get feedback on the spec i enjoy and hopefully improve as a healer.