Earlier today, I discovered fronted adverbials. So here, 'earlier today' is a fronted adverbial. Here are some more examples. Calmly, the family sat together and watched a movie. Like a cheetah ...

So, having established that sentence adverbials of those sorts are not grammatically improper, let's look at some sentences of the kind criticized as having danglers that really aren't ambiguous.

However, as I battle to teach adverbials, or struggle to find time for developing pupils as active citizens, the chance to refresh, reduce and repurpose our national curriculum is welcome. The ...