Who is struggling to find the perfect personal productivity and task management app?

I have looked around for a long time and not found yet a great solution for my task-management & productivity needs. I have many workstreams and projects to work on mostly by myself. I am looking for a simple tool that allows me to: a) write a to-do list of tasks (as simple as Google tasks but) with: expected duration, priority, deadline b) allocate these tasks in my Google calendar intuitively, like drag and drop from the task list into the available time slots in my Google calendar. End result would be a week fully planned with tasks, in addition to events, in a time-blocking fashion c) visually highlight issues (e.g. overlaps) in the calendar when things change, move or take longer than planned. Potentially: c) break-up a task into blocks that fit into the empty slots. Leave the unscheduled block of a task in the task list with the new expected duration (=original duration - scheduled block) d) suggest ideal scheduling of the tasks to reflect priorities and deadlines. e) prompt at the end of the day: "have you completed XYZ task as planned?" and adjust the task list accordingly (e.g. if I skipped or didn't complete somethine, return the task to the task list with the new expected duration) Anyone has come across something that does this? I have used ToDoist, TimeHero, Skedpal, Trello, Asana, Google Tasks and never found something simple which does all the above. If there's no such a product on the market, I will do it! :)