IMHO, productivity tools should do more to help us stay on task: they should help with all aspects of cognition - from capturing ideas, to making plans, to making good on those plans. Fundamentally, productivity tools need to evolve to help us deal with the emotional components of 'getting unstuck'. It's the biggest problem, at least for me.
Which is why I'm currently stuck myself :) I've almost but not quite finished an MVP of a task management tool that addresses those things, via techniques taken from CBT and DBT therapy. I'm 80%-90% from a public release, having just brought in a designer to help make the MVP more attractive and building an approachable FTE for someone who's seeing this for the first time.
If anyone is interested, the first draft of the landing page is at https://catchthinkdo.com . I'm not opening signups yet, but if anyone is interested, let me know here, and I'll ping you when I actually launch. Fwiw, I'm not planning on charging my initial users, in perpetuity.