After the opening rotation and once mechanics kicks in, there is no fixed rotation anymore. It all becomes a priority system.
This as been stated multiple times but it doesn't come as a surprise considering your knack for ignoring everything that contradicts you or proves you wrong.
Being able to read a tooltip is not experience. Titan being able to tank when you support him is not knowledge, that's what tank pet and classes do.
Actual knowledge requires you to test multiple rotations, math out the maximal potency out of each of them, look at what is and what isn't on the GCD to weave skills in, knowing if certain situations warrant clipping DoTs, knowing when Shadowflare becomes a single target buff in correlation to its cast time and the certainty that the boss will not move for said amount of time. It's knowing how to micro manage your pet without taking a hit to your damage. Actual knowledge comes testing your job, from wanting to min-max it, learning as much as you can out of it, to push it to its limit and with that knowledge, put it into experience to try to become even better. Then you can say you know you really know your job. And with the tool available in the game, it's not just not feasible to do all of this. After all, how do you think accuracy caps were figured out ?
Reading a tooltip is not experience nor is it knowledge. You can say that you don't need a parser to learn the basics and that's true. But don't come and say just reading the tooltips will make you the best at your job. You always need a way to validate your data and inputs and the game by itself does not allows us to do that. So there is no way that you can come here and say you're just as good as everybody else based on what you see in game, it's just not true.
By the way, it's kind of ironic to see you talking about optimizing your job and knowing how to play yet you do not even have Swiftcast as a Summoner.