Feature summary (what you would like to be able to do and where):
A new way to create or edit items based on a schema instead of now only from scratch or complex not really well maintained or too complex external tools.
Use case(s) (list the steps that you performed to discover that problem, and describe the actual underlying problem which you want to solve. Do not describe only a solution):
I am leading a research project which generates biography data on academic scholars. For the most part, these scholars already have a wikidata entry, but barely any (connected) entity data. I am willing to invest time to contribute this data to WikiData, but have no expertise on which data schema is suitable for this kind of entry. In order for me or equally non-expert research assistants to be able to contribute domain-specific data, it is necessary to have a form based on a schema which suits the object being edited (such as "academic scholar") and which provides fields that are generated from the schema and allow to enter the necessary information or link to other entities (via search/autocomplete).
Benefits (why should this be implemented?):
Because it lowers the barrier for non-experts to contribute or update WikiData data and provides data validation to avoid the adding of non-standard/duplicate/non-normalized entity data. In general, in my view, this would significantly boost the participation of domain specialists which cannot afford the time to deal with WikiData internals.