One point this article skips over is that Dijkstra's algorithm can be used more generally to find a shortest paths tree to all destinations, whereas A* is really just a single-source, single-destination pathfinding algorithm. Adding the heuristic obviously gets you to termination faster, but the work done by Dijkstra's algorithm isn't wasted if you're actually going to use it later.
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One point this article skips over is that Dijkstra's algorithm can be used more generally to find a shortest paths tree to all destinations, whereas A* is really just a single-source, single-destination pathfinding algorithm. Adding the heuristic obviously gets you to termination faster, but the work done by Dijkstra's algorithm isn't wasted if you're actually going to use it later.