I miss the usize type when I'm not coding in Rust. I find distinguishing between 'an integer representing a quantity' and 'an integer representing an array index' to be very helpful sometimes.
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Considering quality, not quantity, when dealing with kids' screen time, and being connected to children's digital lives:
I'm comfortable choosing sorting algorithms for a computer. Choosing a sorting algorithm for a human seems much harder.
For example, suppose you want to sort a shuffled deck cards. Quicksort seems too fiddly for a manual process with a relatively small (52) quantity.
I'm acquiring a taste for the Rust numeric types. usize usually represents an index, i64 a quantity, and Wrapping<u8> an emulation of hw.