[pjmlp]

"They are likely the two most difficult parts of any design for parametric polymorphism. In retrospect, we were biased too much by experience with C++ without concepts and Java generics. We would have been well-served to spend more time with CLU and C++ concepts earlier."

Yeah very critically.

[piekvorst]

You can’t be omniscient, I think.

[pjmlp]

It is sufficient to actually care about history of programming languages design, acknowledge the paths trailed before since FORTRAN came up in 1958, no need for omnisciency.

Less "we know better", more "actual history".