Extreme wealth disparity is not due to a lack of taxes, but rather a lack of competition.
No.
No no no.
This isn't personal (assuming you wrote this, you mention your site, so I'm assuming) but I'm just so sick and fucking tired of people thinking they've seriously analysed the state of affairs of the world, but not only refuse to even name capitalism, let alone point to it as the core problem, but worse, insist on the nonsensical idea that we can and should fix things from within it and under its rules (and in your example, using one of its most toxic and destructive elements), instead of realising the only way to free ourselves is to abolish it entirely, as if capitalism is some sort of natural order we simply can't exist outside of.
I don't know if you meant it to, but your analysis gives "an"cp vibes in how close it gets to getting it, and then how fast and how far it eventually veers off course.
Whatever the case. I think you're close enough to benefit from exploring further if you think you can set your biases aside and sit with the discomfort of unlearning the constructs you've been made to believe are natural and unavoidable, otherwise you're just going to keep skirting the issue but never hitting the point.