Look after #1, especially during winter.
Although some operators may allow a flex take off after de-icing i.e. there are no general regulations prohibiting it, this does not mean that there are no hazards. Remember that it was only during the last few years that the problems with type 4 fluids were discovered, these resulted in new procedures and limitations for many turboprop / regional aircraft, and proof of any hazard for larger jets is still in abeyance.
The using de-icing / anti-icing fluids contaminate the aircraft surfaces; all that you are doing is replacing one contaminant (of unknown effect – snow, ice) with another (with assumed known effects - fluid). Thus great caution is required when operating in these conditions. There are many various states that an aircraft can be in when treated with fluid; the type of fluid (1-4), the fluid-water mixture, the fluid spec (vendor), the conditions in which the fluid has been kept (age, heat), and the method and amount of fluid applied.
You may think that flexing will help your management, but they will not thank you after a mishap during winter ops involving de-icing / anti-icing fluids. Safety first, look after #1, especially during winter.