Comment by tom_mellior

> If you don't know whether the compiler assigns something to be evaluated lazily or eagerly that could lead to a lot of nasty debugging issues.

If the compiler only forces values that would be forced anyway, there shouldn't be a problem. Which is why GHC actually does it: https://wiki.haskell.org/Performance/Strictness

Strictness analysis is good and useful... and difficult and not magic.