But to follow that logic, either can give a false positive - I've had gauges which misread, which make you worried.
What's needed (imho) is a happy medium driven by the ECU - have it that you can have say, a warning threshold on water temp so if it exceeds it x times within a given interval you get the EML and a limp-mode, if you hit the next threshold you get engine cut. I agree, gauges can give you a nice context, but again, unless you have something light up like a christmas tree, gauges just distract you in everday usage.
This only comes from my experience of monitoring performance of large estates of equipment (not cars) - it's fine having gauges and statistics coming out of your ears - unless you have a decent metric to measure against, or some automation to react then measuring any given value manually is not infallible. Heck, most logging data in the syvecs is more than we ever need, it's useful for diagnosis post-event for sure though - I'm hoping to get Scal up and running and read it a little bit.
I'm going to do a nice thread writeup soon I'm now not sure what's more addictive a sound in my car - the wastegates/screamers, or the lovely TC sound that the Syvecs makes It's a la F1 TC.... lovely.