Context

Unparsing modes cause problems (see #2694) and the protocol should only use Optimized and Optimized_legacy, never Readable.

All functions in apply.ml use Optimized so let's simplify them.

Manually testing the MR

Document the interface of any function added or modified (see the coding guidelines)
Document any change to the user interface, including configuration parameters (see node configuration)
Provide automatic testing (see the testing guide).
For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
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