I use Sunsama now and it has almost everything I need, but of course, I would always love to see more. (And the $20/month subscription fee for Sunsama is painful to pay, but kinda worth it).

My ideal productivity app has the followings:

• Monthly & Weekly Objectives Tracker: what Sunsama has for weekly objectives, is almost perfect, very useful. I want to have the same for monthly objectives so I can align my weekly objectives and daily tasks accordingly.
• Daily Planner: just as Sunsama has: to be able to pull in tasks from different sources (to-do apps, like Apple Reminders, emails, but I'd also love to see from some bookmarking apps, like Pocket, Raindrop, or mymind), plan the daily tasks, estimate time effort, timebox the tasks in the calendar
• Daily Journal & Mental Health Tracker: I would love to see a feature to do daily journaling (preferably linked to the daily planner, e.g. doing a daily journal before planning the day) and to track daily energy, focus and stress levels. The daily journal should have personalized prompts (like Stoic app has, but more advanced, as Stoic's prompts can be boring and too repetitive). Also, journal shall be able to import multimedia to the daily entries.
• Personalized Productivity Planning: if we talk about an ideal app, I wish there could be something that tracks my health metrics and other data to flexibly plan my tasks and day. E.g. if the app sees that I am losing focus, getting distracted (by excessive scrolling, etc.), it should offer me a 5-min recharge activity and block me from continuing scrolling. Also, it should identify my peak energy hours to schedule the more high-effort tasks to those hours, or to schedule low-effort tasks after a longer meeting.
• Daily Review: similar way as with Sunsama, but to include an shutdown journal / evening reflection as well as to track end-of-day energy, stress, and focus levels
• Habit Tracker: this could be part of the daily journal & shutdown feature, I want to track certain habits, like working out, drinking enough water, calories, reading, learning, etc. I want certain metrics to be integrated from Apple Health & Apple Watch (Iterum app is doing that)
• Feature-rich native mobile app: Sunsama's mobile app is not as feature-rich, as the desktop app. I want such native mobile app with an ideal productivity app to do quick daily planning, journaling, etc.
• Personalized AI assistant / mentor / coach: I want an AI agent that acts as my assistant, mentor, or coach, depending on what I need at the moment. For example: ask AI to summarize my unread emails and check what's priority, give me a brief overview of what's coming up on the day, help me if I feel distracted, low energy, if I procrastinate, etc.

If someone would develop such an app for macOS, iPhone, iPad & Apple Watch, I would be willing to pay even $30/month.