Going by the screenshots and by the actual wishlist item, it seems obvious that some things were completely missed.
- No menu to filter types of templates (https://phabricator.wikimedia.org/T55590) - The wishlist seems to specifically ask for an infobox wizard and talks about newbies, but there is neither any way to filter only those infoboxes, quote templates, or anything else. This could be implemented by either fetching most used templates in a category or using wikidata to get them in non-english wikis, e.g. https://www.wikidata.org/wiki/Q19887878.
- Date type is not properly supported - It seems that the wizard either has a limited interpretation of the templatedata spec, or simply ignores it. The spec also allows the use of time in addition to dates. But this doesn't seem possible with this tool. Arguably, the templatedata spec should be improved to indicate the expected output format.
- Inability to select from a list of items (https://phabricator.wikimedia.org/T53375) - the wishlist item talks a lot about invalid structures. This doesn't address wrong template input, e.g choosing a country name from a dropdown.