I vehemently disagree with diminishing CC, this was a nightmare when it was actually a thing, I don't want that back at all, so no, not all the crowd agrees. Also I feel that most people that constantly bring that back completely fail to see what it would actually entail, meaning:
1) Having a diminishing icon buff for EVERY single type of CC (like back in Stormblood)
2) Diminishing as in, 100% to 0% immediately, or gradual diminution? If the latter, how does one track at which diminution rating any kind of CC is at any time on somebody? More buff icons to track?
3) Staying glued even more to party and enemy lists to try, parse and make sense of all their buff and debuff icons every time one wants to use crowd control. Sounds very realistic to me for something you'd want to be instant decisions, on top of it.
4) For how long does one keep the diminished return buff after getting cced? Until Purify is back?

I'd rather explore other options.