Jumping from 104 to latest release

Was lazy enough to not update when python support was dropped.
Now decided to go for a fresh install of latest HASS OS and then pulling the config files, going through all the breaking changes e.t.c
The only question is that it seems that devices are no longer being configured with yaml. So i will need to configure most of the services from the web interface? That will give them new entity_ids recking havoc in automations?