I have similar use cases and input sources as you (I think). I am careful to use Evernote as my everything box so I do not have stuff spread everywhere. I don’t think there is a single app that does it all.
My simple workflow objectives:
Frictionless capture - easily capture all of my inputs quickly no matter what I’m doing or where I am
Quickly find - find my stuff without hunting… find it fast the moment I need it
With that, I’ve found Evernote to be my best option for the “Everything Box”. All of my inputs end up in Evernote:
Handwritten notes on iPad - GoodNotes. When finished, I export to Evernote. I have a Workflow that I use to supplement the export with information from the Meeting invitation (if applicable)
Paper - either Scansnap to Evernote or Scanner Pro (with auto workflow to Evernote)
Typewritten (while on Mac) - typically directly into an Evernote note. Again, I have some automation to pre-populate note template with Meeting invitation information
Typewritten (while on iOS) - typically Drafts. Actions move notes to Evernote. I use a “Meeting Notes” workflow for typed meeting notes (handles reminders, etc)
I’ve found this system to work very well for me for many years. Easy input in any setting, but one place to find my stuff.
Glad to elaborate on any of this, if useful. — jay