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The tado forums have lots of people complaining. I think the v3 bridge has the capability for some autonomy but the older ones don't and they don't want different feature sets for different user groups.
Pedantically I think a TRV can call for heat, and so switch your boiler on, without Internet connectivity but a TRV can only get a new target temperature from the Internet or by turning it locally.
You can have local control of TRV target temperature using the Webkit integration. Presumably from Apple things, I've tested it from Home Assistant.
Woke up to a cold house this morning to discover that the internet went down overnight and as such tado didnt activate the heating. Seems like an enormous oversight for Tado to be designed to be entirely dependent on access to the internet to just switch your boiler on?