Earlier quoted context omitted.
That sounds like a nightmare to do without software computing it. I realize you and likely everyone reading this use tax software, but many people still do them by hand, and this would involve an individual tax-rate lookup for each transaction rather than just grouping them into short/long-term capital gains.
Do any people doing them by hand actually make these investments directly, or do they use intermediaries? Is it that hard to require the intermediaries provide end of year reports? I don't think this level of extra computational burden is a good counter-argument against more sane tax policies in this day and age.
Maybe some stock brokers or weird investments don't do this?
I would hate having to do all that stuff by hand.