So far the only things of note that Bitcoin has achieved is having a considerable impact on global warming and making it near impossible for mere mortals to buy GPUs at reasonable prices.
Even if any of the touted advantages were to finally materialize now, it wouldn't have been worth it.
Graphics cards were definitely bought in stupid amounts for this purpose.
Maybe not for Bitcoin anymore, since there is specialized hardware now, but it doesn't really matter which proof-of-watts-per-hour cryptocurrency we're talking about. They're all shit and the planet would be better off without them.
Only people who are rationally mining bitcoin with GPUs are those who don't pay for their own power.
Hashes per watt efficiency has risen very fast.