The second example (the one with `auto msg` in the lambda) is ambiguous, I think. What should the type of `msg` be? `std_msgs::msg::String::ConstSharePtr` or `std_msgs::msg::String::UniquePtr` or something else? I don't think the compiler can implicitly infer which type you mean in this situation.
What you're doing might work if you also supplied the `CallbackT` template argument to `create_subscription`.
I'll play around with the example and see if I can simplify it. It should be possible, in principle, to do implicit template specialization on the `create_subscription` method, such that you can drop the `<std_msgs::msg::String>` explicit template specialization. Then you'd just need to explicitly type the `msg` parameter to the lambda.
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