The word so feels wrong to me, but I can’t articulate why. I hear this pattern (I got so many requests to X.) frequently on a particular Youtube channel and I always think to myself You got so many requests that what?
Some definitions for so use it as above, but they tag it with the word ‘informal’, such as:
- Informal. very or extremely: I’m so sad.
http://www.dictionary.com/browse/so
That doesn’t tell me what's wrong with the sentence. Why is this use of so considered ‘informal’?