Responding late to a the ninja edit....
Actually, no - The SSS dummy is not a rotation assistant. It will only tell you if you meet the needed DPS to do a specific fight, not how to improve to get to that point. In order to find that information out, you need to go outside of the game or ask others for help if you're unclear. Furthermore, the SSS dummy doesn't even tell you what your total DPS is, again, you need to go outside the game or to use a 3rd party to see that information. If does not tell you the % of time that your dots were up, where you let your buffs drop off. It simply gives you a pass/fail.
Imagine you're taking a test, you feel confident in your answers, but you get a failing mark back. You have no idea where you went wrong, you had been doing everything right (or so you thought). This can either be demotivating to people and motivating to others. Some people might right up and quit, or they might just point the blame in another direction and keep on doing what they were doing. The game does nothing to help these people, except for nerfing the content so they can continue to progress in it without making any effort to improve themselves.
I actually see huge value in the SSS dummy, but I think you're misdirecting the current audience that makes use of it. It's not people who are looking to learn or improve their rotation using it, it's players who are looking to beat their times or see to what degree they have improved.
Yes, players should be able to clear the content provided. But there's simply people that don't want to improve and there's people that don't aspire to do anything harder than expert roulette. The outline that you described, still exists in the game - it's just spread out over 60 levels of dungeons and fights and primals and guildheists. Raids are about about taking all the knowledge and applying it in a setting where there are consequences for screwing up and not pulling your weight. You can do things 100% correctly, but to raid, you also need to work as a group. That means adjusting on the fly when someone else makes a mistake and learning how to adapt. The proposed solutions does nothing to address that skill or working as a group.
Let's take A9S as an example. The tutorial for that fight is the normal version and a lot of the mechanics are the same. Bombs on the adds, adds die on fire platform. Even the alarum/mini puddle is a mechanic that they have used in previous fights. The stack mechanic, used previously and extensively. Mechanically, the fight is easy. But if you don't have the DPS to kill the adds in time, that's a bigger problem. You asked for feedback and I simply don't see how adding in a system that would spoon feed players what mechanics are used would help, when that too already exists in the game.
The raid fights are 100% scripted. Meaning that the boss will do a certain mechanic at a certain time or at a certain threshold of HP%. Players simply need to pay attention and learn from mistakes.
The best and most effective raid assistant in game is it's player base. There are hundreds of guides and videos that break out each mechanic of fights and show how to deal with them effectively. I've helped and hosted a ton of A9S learning parties, breaking down the mechanics for people who are new and looking to get into raiding and giving them tips on how to improve and giving them tools that they can study further to help them in their next learning party. I know I'm not the only one doing such things in game either. The very idea that you're proposing also already exists in game with each and every person who cleared the content and who wants to help others and who will patiently explain mechanics and safe zones and solutions to commonly made mistakes.
I read your initial post. Me not agreeing with it is not being "snarky", it's simply giving the feedback that I do not believe that the situation you proposed would have any effect on helping players bridge the gap into savage raiding as it merely only serves to address specific mechanics and the raiding environment is more complex than that.
