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Lutron is a good demonstration of a company going about it reasonably. The smarts are in the bridge not the switches and not the bulbs.

For context, Lutron is a client. Though I am just a happy user of the Caseta product at home. I don't have any engineering say in how it was built.

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Can they be interface directly with home assistant without wi-fi?

I am not sure. I do have mine pair with my iPhone using the picture on the label of the bridge. The bridge itself communicates with the dimmers via the same wireless protocol the pico remotes use. The bridge has all the smarts in it for working with apps, doing schedules, etc. My bridge is about 9 years old and is still getting updates. Internally, I am aware that efforts are made to ensure that systems work for 20 years or more.