I’m a little worried about this one, considering the complaints here: Embedded List View "Show all" is very hard to notice and it causes confusion
I’d say this is a bit different problem. The “show all” on relation views is sort of detached from the data so it’s hard to even notice this button.
With the lazy-loading implementation, “show more” buttons are inserted right next to your entities on the same level. So hopefully there will be less ambiguity
Also please note, that previous limit was flat, 3k for the database until yellow banner with “show all” appears. This equals to just 30 entities with 100 children and there were no hints if other entities have any children.
After the improvement the limit is per parent so it can easily be 100 entities with 100 children and you always know which one have children and where there are more