Well honestly, I find this to be too idealistic as well.
Like...yeah, sometimes, people do into this not wanting to have fun. They want to make money, and that's cool and all. That's valid, especially if you have the skills. But they've gotta remember -- this isn't really as concise and set in stone as STEM-related careers or something you know will make money.
It's based on subjectivity and business; comics are a form of entertainment, and how it connects to a readership. Even if you DO end up working with what's popular now, you're still not guaranteed that you're gonna be successful or that, if you do get it, it will last. You'll still have to compete or work with other creators that have either been at it longer and know what they're doing or just have a knack for the industry. Even more, the market changes all of the time, so what's popular today can be gone tomorrow.
I feel the reason people insist on the reevaluation because you still get a lot of beginners who forget about the work behind it. Comics are a lot of hard, especially when there's a chance you might not make it.
If you're doing this for money, is this something you can actually keep up? Will you feel like you're wasting your time? Are you prepared to put in the effort, knowing that you might not be as popular as you'd like to be?
That, and there's no concrete step-by-step way to get popular, and I think that's what most people hear from those asking "how do I make money on comics? How do I become popular?" It sounds like someone's asking for a secret formula, and like...there is no formula. It's only based on the suggestions you decide to take.