In older version of HA, there was a way to edit properties of devices and entities like lights. For example, I could edit settings in order for a color picker wheel to be visible for color enabled lights. I can’t seem to find this option anywhere. I understand this can be done using the config.yaml, but I miss the GUI version.
With customize, one is changing the state machine directly, without any checks. This comes at a risk. Additionally, for many use cases (like: name, icon, device class) one should edit the entity via the UI instead, which is possible for the greater part of the entities nowadays.
The old customize UI is confusing in many ways and has a level of power that, if wielded incorrectly, can have unforeseen consequences. Someone found and used the customize UI first, and then things are out of sync throughout the UI, as the internal entity registry would show the old values.
The customize UI also relied on setting up an include and YAML configuration to begin with; which already made it an advanced feature.
Therefore, the customize UI was removed and remains available as an advanced YAML feature, additionally we have added the capability, to adjust the common device_class changes using the “Show as” feature while editing the entity from UI.