You are!!!
I would want to know that something has happened - as you did so! (Along the lines of "C/S MAYDAY, engine failure, stand by"
As you say - you fly it , and we have the information needed to work out that you may not route as expected, you might want to hold/return/fly straight etc. This means we can alert the relevant agencies, including other sectors whose airspace you are flying through, stop deps and think about breaking stuff off the approach etc
Then when you are at least airbourne and away from the ground I would like to know what you want to do - but only when you are ready and able to tell me!!
It is not reasonable to expect controllers to know about company SOP's , as they will vary from company to company and type to type
hope that helps
louby