WTH is migrating from Shelly4Hass still a pain?

Shelly4Hass id no longer actively developed. I get that this is an external integration but WTH is there not an easy way to migrate to the native integration which is developed later on?

There has been a WTH in 2022 when Shelly4Hass was in active development.

The posts in this topic make clear just how bad the experience is.

Try to do this
Work for me

Don’t get me wrong but… if you decide to use a custom integration, you agree to all the inconveniences associated with it. The HA core team doesn’t support custom integrations.

WTH is for issues built inside of HA core. Thank you. If you wish to ask for a new shelly4hass built into HA, please create a Feature Requests