WTH can't I link or merge devices?

Allowing helpers to be associated with a device was a huge win. However, anything outside of a helper such as a template in your configuration, or a HACS integration that supports an existing device can’t be linked or associated with its corresponding device. Battery Plus is the only integration that seems to do this correctly, adding entities directly to the original device. WTH can’t I do this with other entities?

Only possible for UI created entities:

https://community.home-assistant.io/t/wth-cant-i-attach-a-template-sensor-to-a-particular-device/803434/2

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In the meantime: Device Tools: Create, Modify and Merge Devices, for yaml based entities make sure to set some unique_id.

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This is one of my peeves too … I’ve got people and when they’re away, I’d like the front end to show their person and some details from my distance from home sensor, but I haven’t been able to get that to happen in a way I like since they’re two different ‘devices’

Ideally, the info is all exclusively related to that person, so, I’d like it all to show when I look at the person ¯_(ツ)_/¯

tbrasser - thanks! I’ll look at that, maybe it’ll help me!

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So I got red flagged as a duplicate against this one (that I read). Can’t see it is the same, but it gets my vote.