The "fundamental building blocks are too flawed" argument is so strange to me. Too flawed for what? To become, by far, the most popular platform in history for running applications? Because it's already done that.
This is a case of the evidence not fitting the theory well, so people complain about the evidence. If the browser/DOM/HTML/JS ecosystem "technically" is terrible, but in practice dominates the competition, then there is something about it that is better. This is not a fallacy, but a simple supply and demand argument.
This is a case of the evidence not fitting the theory well, so people complain about the evidence. If the browser/DOM/HTML/JS ecosystem "technically" is terrible, but in practice dominates the competition, then there is something about it that is better. This is not a fallacy, but a simple supply and demand argument.