Most GIS tools are built for analysis. The map is a workspace, something you stare at while you run queries and crunch numbers.
But for a lot of teams, the map is the deliverable. A client needs to see where the sites are. A board needs to see which regions are underperforming. A planning officer needs to review the proposed route. The job isn't analysis. It's communication.
And that's where everything breaks. You can't send a shapefile to a client. You can't embed an AGOL map without making it public. You can't share a Felt map with embed controls unless you're on Enterprise. So you end up exporting screenshots, emailing PDFs, or building something custom that nobody wants to maintain.
Topologis exists because the last mile of GIS, getting the map in front of the person who needs it, shouldn't be the hardest part.