I think it's perfectly fine to subjectively prefer one result over another. I like thinking of results in color science as tools to help designers, rather than

I think it's perfectly fine to subjectively prefer one result over another. I like thinking of results in color science as tools to help designers, rather than some objective truth. There's a lot of scientism. From that perspective, I definitely support offering designers either an IPT or Oklab based gradient tool. With the lightness predictions, it's likely that Oklab will do a slightly better job on blend modes, but clearly they're both good color spaces, certainly a major improvement over CIELAB which is vastly more popular.