In Webflow's CMS, your limits include;
In the Webflow designer your limits include;
Nested Collection lists are supported, however they;
If you don't design for these limits, you'll almost certainly hit them, hard.
Like a kid running full speed into a wall, you'll suddenly be laying there dazed, wondering what happened, why the world is upside-down, and why you're wearing your ice cream.
For me, it was coffee.
Most people encounter these limits completely unprepared.
The truth is, those limits really aren't a problem in good site design at all. You just have to be aware of them, and how to design with them in mind- the same way an architect needs a basic grasp of gravity and local weather, in order to build a decent home.
If you have hit these limits and it's frustrating your design, you probably want to rethink your design.