Include new features in handbook instead of referencing "What's new".

While reading through the handbook I find something like this: "From TypeScript 3.7 and onwards, you can use optional chaining to simplify working with nullable types." Where "optional chaining" links to the "What's new" page for version 3.7. Why not include this in the handbook but put references - in the handbook - to other pages explaining "What's new"? Please include all features of the language in the handbook. Actually I'd suggest to always update the handbook and only put references in the "What's new" page with a link to the relevant pages in the handbook.