I was mostly thinking of the #1 mentioned by actinium226 in a sibling post, fwiw.
The main other thing I was thinking of was that GC languages sometimes have features that are very hard to support sensibly in non-GC languages: My favorite example is the higher-kinded types (HKT) which e.g. Scala and Haskell support. These can incidentally be used to "tame" side effects in a very principled way (via Monads). Another example would be lazy computation/values.
(Other applications of HKTs are validation integrated with parsing while still providing the maximum actionable feedback to users.)
The main other thing I was thinking of was that GC languages sometimes have features that are very hard to support sensibly in non-GC languages: My favorite example is the higher-kinded types (HKT) which e.g. Scala and Haskell support. These can incidentally be used to "tame" side effects in a very principled way (via Monads). Another example would be lazy computation/values.
(Other applications of HKTs are validation integrated with parsing while still providing the maximum actionable feedback to users.)