There are dozens of Mods and GMs in these forums that have a dricect connection to the BBs - at least one of those officials could update a suggestion from time to tim.
The view of a Forum Mod or GM might not necessarily be the view of a BB. You will find that Mods and GMs do reply to these suggestion threads and view them regularly. As your initial reply was directed at a GM, it kinda moots your point that GMs don't reply.
I have never read any suggestion that asked for player roles, or suggested something like the salary change we happen to get now - but there are frequent request for other things, like jerseys, other trophies, fixing game viewer bugs and so on - if you want to sell a product it doesnt hurt to listen to your customers sometimes...
You must have not seen all the discussion on the forums about teams not happy finishing 5th and how tanking to finish 6th was better financially than finishing 5th. There have been enough discussion/people complaining about this and I am glad the BBs have now done something about it.
Yes there are frequent requests for the jerseys, trophies, etc but they are all aesthetic changes that do not improve the actual way the game is played. While those suggestions are nice to have, they are not crucial. Unfortunately, BBs don't have the budget to have 100 developers so they will have to prioritise the enhancements on what they see as going to add most value to the game.