In direct combat, I tend to agree with the current proposals. Don't be flashy, let someone else draw the attention, drop all sorts of chaos into them to keep them form thinking, and end the fight before they get a chance to pause, breathe, and figure it out. Or just don't wander in to the line of fire in the first place, since your spirits are generally better than the rest of your team at whatever it is you need done.
Operationally - don't flaunt it. If you run the stats, there's about 3 "natural magic 6" mages per 1M of the population. The number of them who elect to be disposable criminal mercenaries as opposed to those take 6 or 7 figure salaries, careers of academic prestige, etc. is probably not terribly large. Every time you flash high level magic around, you are slashing the available suspect pool while at the same time driving up the case priority due to the extreme threat a loose cannon high end mage represents. And that level of threat is the type of thing you take to your superiors and say "yep, we need permission to go lethal on this one" and then splash their brains over a wall without warning rather than arrest them or try to storm their building.
So, short term, yeah, tactics count. long term, every time you use magic, be aware that the stronger it is, you are calling on not just security guards but the very immutable gods of law and corporate profit themselves to mercilessly target you.