That's actually up to SE, not the player. They're the ones creating the content to meet their goals.
The player has the option to participate in the content within the rules that SE has set for it or to not participate.
Ironic when you say you should be allowed to overlevel then complain about the consequences for overleveling.
It's not broken. They addressed an exploit some players were using.
If the roulette is the problem, then that is what SE should remove.
The problem is some players are making trial accounts expressly for the purpose of having a character that ensure a party ends up in CT then leaving once the Alliance is formed. It's not a punishment when they had no intention of doing the roulette in the first place.
SE could also remove all players that queued with the character that left the instance but that probably wouldn't change much. You'd instead get the character staying with the Alliance but probably not contributing anything. Once the character levels to 60, start a new trial account to do it over again.
To me the best option to fix CT cheese is to remove CT from the roulette and give it a dedicated roulette. The game won't be hurt by an additional roulette and those only interested in CT will continue to have a roulette they can do while others will have the benefit of 2 roulettes to choose from.
It hasn't done anything to change the situation on Dynamis.