I think your question should be pointed at Qlik Maps directly? At the top of this forum there are links to GeoAnalytics capabilities. It depends on what you're trying to accomplish and whether it's supported already. I've found that Qlik is usually very responsive (I work with Patric Nordstrum).
A few years back, we evaluated (among others) Qlik Maps and Idevio (which was later acquired by Qlik as GeoAnalytics) At that time we recommended Idevio to our clients.
Most of the mapping visualizations have been ported from the GeoAnalytics extensions into the native map object (April 2020). As for the ETL side, I believe that the GeoAnalytics connector still provides functionality that "native" ETL does not.
Generally, I've found that sticking with Qlik's capabilities (whether native or GeoAnalytics) is more sustainable and provides a single source for support and logical upgrades paths.
If you are looking for more advanced geospatial capabilities, then you might need to consider ESRI and/or Safe Software's FME products.
UI Extensions: which I will say are becoming less important as the functionality is moving into the "core" map object. At this time (April 2020), the differences are quite subtle - but can be useful. The one that springs to mind is the GeoAnalytics Point layer which allows for dynamic (fx) images, whereas native map just a singular image.