That the "authorities" allow taxis to make pick-ups on level 4 (or 3 at DMK; taxi drop-off/departures- a service which many, including myself have utilized especially if going somewhere close to the airport) even though this seems like it might not be "legal-ish", it seems like any "officialdom" might be more inclined to support the taxi driver in a dispute? Any dispute is likely to involve quite a bit of time as well as more and more "authorities" are summoned and the situation is replayed countless times.

I agree that, even though there are cameras everywhere, a taxi driver might be less inclined to physically assault someone there, it still may be hassle? I guess if you have the time and you're a quick runner, and can make it through the gate hauling your bags, and can disappear into the airport then by all means, stand your ground and settle any fare disagreement then and there, and do a runner if you sense a threat. If things escalate and the driver returns to the car or trunk I would skeedaddle.

Personally I'd recommend choosing where/when to argue about a relatively small amount of money - assuming you let it get to that by not sorting out the fare/meter issue previously, but then do follow up with a formal complaint with the DLT, which is so very easy to do and might actually end up making a difference.