This right here. GIS is accessible to anyone who knows Javascript, Python, and SQL thanks to the open source GIS ecosystem. Previously it was the sole domain of ESRI priests.

Now this is a net good thing, but there are downsides. Generalists wielding specialist tools means that a lot of the wonky basics aren't known until things break. But this is a blip compared to the step-change of making an entire field accessible to anyone who's a decent programmer with a healthy appetite for research. It's crazy how much you can spin up with PostGIS, Python, Mapbox and/or Leaflet...no ESRI license needed.