https://www.wikidata.org/wiki/Wikidata:2020_report_on_Property_constraints suggests or talks about the possibility of addressing some tasks on Property constraints, while other tasks and decisions can be inferred from the data presented.
The development team, the community of editors. or both, depending on the scope of each change, should decide which tasks will be addressed and which will be declined or postponed.
The subtasks of this task should not necessarily be understood as more important than other previous Phabricator tasks about Property constraints.