Hi @jessh and all,
Thank you for the feedback 
I’d like to announce that the limit was increased to 100 connected projects that automatically rollup to the goal progress.
Also, the total number of items was increased to 120:
- projects connected for automatic progress rollup
- tasks, projects, and portfolios in related work section
For example:
- When we have 100 connected projects, we can have 20 other related work items.
- When we have 80 connected projects, we can have 40 other related work items.
- etc.
It’s not still unlimited, but I hope the update helps!