Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the issue has not already been raised

Issue

Well in #4520 there are basically two opinions about errors:

• all thrown errors should be created by @fastify/errors
• errors which are exposed at runtime should be generated by @fastify/errors ans errors which are thrown at startup should be native errors.

For the first you could argue that alot of errors are already transformed and it was always the target to replace all native Errors.
For the latter you could argue, that in fastify.js we throw native Errors because the input objects are already invalid.

Can we have a clarification, a clarifying discussion or can i have a link to place were this was already discussed and/or clarified, please?