WorkTree VS super-productivity

It took me years to realize that the most difficult thing is actually to systematically derive what to do, and that in any decently complex project systems engineering (an art and science apparently long forgotten) methods are the only way to derive that in a sufficiently reliable way. The result is - no wonder - not just a gantt chart, but an n-dimensional model with multiple levels of detail. The PMI writings just tell you that you e.g. have to create a WBS, but they leave you all alone with how to derive something like this systematically. Accordingly, the many PM tools seem helpless to me, where some computer scientists have simply built something that corresponds to the outward appearance of what they assume under PM.

I worked for many years on large, complex government projects and eventually started building prototypes for tools that would be useful (e.g. https://github.com/rochus-keller/FlowLine2 or https://github.com/rochus-keller/WorkTree); but you would have to invest a lot more development resources, and whether people would understand the tools and their usefulness (so there would be a market) is questionable.

SuperProductivity ( https://super-productivity.com/ ) cross-platform and feature-rich, been using it for a year now.

https://app.super-productivity.com/#/tag/TODAY/tasks This cannot do 2 and 3 by itself, but it can integrate to many calendar services and achieve 2 and 3 through it. Manual here https://super-productivity.com/

Super Productivity (version 20.0): Free to do list & time tracker for programmers & designers

I had a lot of luck with super-productivity for a while. I liked that I could store the data on my own webdav server and have it persist across all my devices, while being free and optionally self-hosted, but there is a learning curve when getting it set up.

If data privacy is a concern for you, you might want to consider a FOSS alternative. Condution is a good option that is available on almost all platforms including MacOS and Android. I haven't personally tried it but Super Productivity is also another option.