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For item #1, self hosted solutions like home assistant also allow using “smart” devices without the cloud in some instances. You are not at the mercy of a vendor going out of business or dropping support and your devices becoming bricks.
Not all devices are compatible, but from what I’ve learned, I would never buy another device with so called “smart” features if it is not compatible with home assistant.
I’ve seen videos mentioning they have started cancelling plans opened on a different region to save money using VPN software, so be careful how much you rely on it.