After conversation with @kdy1 it turns out it's not really needed.

Side note:

There are two kinds of errors.

The returned Err (from parser) is unrecoverable error, and it means the parser gave up parsing because it met something bad.
Errors from take_errors is recoverable (in the point of view of parser, not runtime), and such errors means the parser recovered from error.

In future, more errors will be recovered, mainly to mimic official typescript compiler.
Recovering errors allows running other validations on ast nodes, so the compiler can show more errors at once.

@kdy1 thanks for detailed explanation, I'll revisit the topic after SWC updates its recovery