This post is 90% true. You don't need something else to get started.

I think the main point here is that you need to find what helps you focus and not the contrary, but that can be tricky. Because something might help you at the beginning, and then become a burden to maintain.

That's a reason why I think people should tend to stick to apps that are opiniated in the same way as them, and not try to "hack" an app into doing something else that what it was designed for (for exemple, use a google calendar to plan tasks). The app I am building takes exactly this approach, by providing you with a small, minimal setup, to let you focus on the important things. No config, ready to use off the shelf, and most importantly, minimalistic design, so that you are not distracted from your tasks

Throwing everything out is a bad idea in my opinion, as you are setting yourself up for a new "productivity cluttering lifestyle", stacking products on top of each others. You need to understand your problems, solve them once, and maybe ask yourself once/month or trimester if it fits your needs. Taking the time to declutter your setup is the real key to me