I don't think you can just label anyone who disagrees with you as "White Knights" ( though I do main pally hmm...) but just gonna say I disagree with your entire post. Honestly Shinryu NM is the last boss of SB and I was quite happy when I saw that he presented somewhat more of a challenge than the previous encounters. Whilst it's a little harsh and maybe blunt but quite frankly this is just a case of get good, literally. If you have gotten to level 70 in your class and you haven't figured out mechanics that Shinryu uses from all the other boss fights in the game, either you bought a jump potion or you need to improve as a player.

Not all fights that are challenging need nerfed, sometimes the issue is with the players and that's what I believe is the case here