Nearly all web or mobile-based products in 2018 involve complex interfaces.

But be aware that in terms of usability, having all your functions immediately accessible, is not always the best solution.
Even power-users appreciate the comfort of a clutter-free interface, and as the learning curve for new users is easier, it becomes a selling point.

That's exactly what Things 3 for macOS (featured in this article image) is doing. Selling an easy to learn interface, to high-skilled users.

A complex product, with a simple interface is also faster to understand for the public, which is very useful in a short pitching context and marketing.

Here's an article explaining this process of complexion reduction on famous mobile apps.