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Now that dart:html usage has been decreasing and is going to continue to. They were moved from dart:html as part of #9213, but that continued to be their primary use.
A Point on a screen does not really belong in a math library, nor does Rectangle. Beyond that, Point declares operators that don't make sense for a point, conflating it with a vector. The * operator on Point<int> can also result in a runtime error when provided with a double 😢.
Some related discussion about performance concerns: #53912
All this isn't to say the functionality they provide isn't useful, but the use cases can now be better supported by focused packages that are easier to evolve. A lot of the previous uses are likely covered by a simple record too.