I have this same issue. Deep OF4 / GTD user for approaching a decade. Love its functionality. Happy to pay my subscription every year.
Also have some items that I have to collaborate with colleagues, and separately, items where I have to collaborate with family members, and separately, items where I have to collaborate with professionals (e.g. my accountant).
For work, we use Asana. It’s really good, but lacks things I value in my workflow e.g. defer dates.
For family, I pay an INSANE amount for Asana (they don’t offer a family plan)
Most of my professionals use one of iCloud shares, Google Workplace, Dropbox, Box. YES, I have to use all 4.
it’s all annoying and complex and inelegant.
Last month I gave up and have been vibe-coding a new platform to rule them all.
I’m building an E2E encrypted OF4-like app that supports the multi-user and collaboration features I use at work. I have a V1 now I’m using with my family. I’m also including features OF4 lacks e.g tracking individual activities on a task (available on most other platforms). It allows me to keep all my prior “OF” things private, and I can granularly share individual Folders, Projects, and Tasks. This is just for my use and collaboration, I don’t intend to commercialize it. But it wasn’t hard to build. The data model is simple and ~75% of the vibe coding time has been on UI tweaks.
I’m maybe in an unique situation because I have a programming background, I like to build apps, and my profession requires me to stay up to date on AI and vibe coding capabilities, so this also serves as a use case for my own education. So I can justify the time, and don’t expect it to be a maintenance burden.
Still, I wish I didn’t have to go this route, I’d rather buy. Since OF has committed to single-user-only it puts us in a bad spot. Either we prioritize OF4/GTD and accept parallel / duplicate systems and multiple workflows, or we prioritize collaboration and go Asana, Trello, etc. Two bad choices but here we are.