Well would you look at that, four different people that aren't on your list got recognised. Yay for ignorance!
Of course, I missed out a few names such as ppowersteef and FlakMaster (and that odd Mcninja guy who post really bad ninja weapons suggestions and still get quite a lot of support). I am not going to list them all, but literally all of them do not have ? as their avatar.
Notice how all of those are to make the game 'smoother' or to fill in gaps? We don't have some stupid 'RIA' or 'Blazing and Toxic armor' rubbish in that list. All of those (save for Pink Gel) are changes centered around increasing player convenience or filling gaps. They are just nice enough to credit those thread makers.
Oh isn't this hilarious. You couldn't even come up with a valid reason as to why the Hardmode hell expansion is unbalanced, despite going on for more than a page.
Wall of Flesh emblem grinding, difficulty scaling and stuff. Some people just want a peaceful, Red Devil-free place for them to farm emblems. They don't want to keep dying to Red Devils and Wyvern reskins just to get all the emblems. I hope you understand that.
I'm convinced that you're either a troll, or just upset/jealous that your suggestion didn't get received well.
Notice the amount of 0 reply suggestions literally everywhere, despite their title being a description of their content?
Please, do tell me, because you have a great history of providing valid reasons. I have my own reasons as to why, but I want to hear yours first.
The devs want to push their game in a certain direction and they know exactly how their game works. They know that Melee + Magic armors are overpowered due to the existence of the Rainbow Gun and Nimbus Rod.
There is a reason why there are some stuff sitting in the 'not implemented' heap despite being nice and all (Contagion): The devs have another thing in mind.
Notice how most of the suggestions they are going to implement are going to be implemented regardless of whether the suggestion was made or not (Modifiers, Frost Arrow + Bullet)?