<<Pushback & start should not be given until there is a clear run to takeoff.
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Not possible at busy airfields; there are too many variables. You need a fair few at the holding points to enable expeditious departures by taking advantage of departure separation standards. Too many heading in one direction may cause delays.
Sloppy Joe..... some people, especially those involved in training pilots and controllers, DO care about R/T standards. It's the way we communicate with people of many different languages and standardisation is essential. Sloppy R/T makes for possible incidents. Short, clearly enunciated, standard phrases are far more effective that spouting a mouthload of rubbish at speed.