Triggers and Limited Templates

Can someone explain why Limited Templates exist ?
Are these used by anything other than trigger variables, and setting up triggers ?

Is the need for Limited Templates because using the excluded functions would yield wrong or non deterministic results at the time triggers are configured (startup sequencing issues) ?

I really want to be able to dynamically (via a template OR OTHER MEANS) set the
entity_id(s) of a trigger from the results of a target selector (yielding one or more entities).

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