OK - quick poll: if you ATCOs tell an aircraft to turn left/right by a certain number of degrees, do you expect a readback of the new heading without asking for it?
how about if bloggs reads back 'new' heading, 'helpfully' rounded to nearest 5 degrees?
And why the difference in styles between the "What's your heading? OK turn new heading xxx degrees" and "turn left 15 degrees and report the heading"
the latter seems to be better from an RT loading PoV, you get the heading change you want AND we do the maths for you.
So any particular reason why one or the other? Just personal preference or is there more to it?