Congratulations on your new role as the CEO of the awesome raywenderlich.com.
Likewise, I believe great content is not free. Time and resources are needed and those are costly.
However, the current subscription fees are not fine-grain granular. What I mean is, people like me are paying for the materials they don’t need. For instance, in my case, I care about Android and Flutter but not iOS or Unity (as well as its books, videos, etc). Some people might not care about Books, too.
So, what I would love to see - as a customer - is that to be able to pick items I need and pay for what I actually use. It would be great if you can split/break the price (subscription fee) per content and per category (ios, Android, Flutter, Unity, iOS Book, Android Books, etc.). I understand it is very complex but helps subscribers pick materials they are looking for.