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Hmm. A few thoughts off the top of my head:
1) It needs to be guaranteed to work. A reliable form of signalling in car would be an excellent thing, but it has to be 100% reliable. 99% isn't good enough. And we all know a race car is a harsh environment and small electrical bits can and do fail.
2) It'll presumably be something else the marshal needs to do - could be an issue if already waving two flags and trying to call in on coms.
3) A risk of the driver ignoring flags and looking only at the dash system.
4) If flags are out, they're out, driver could easily argue the light didn't come on in time/at all as his reason for the subsequent incident.
5) Drivers mostly just need to observe the existing flags, which is a constantly recurring theme. Ever more new and interesting methods keep coming in to cover for the fact that drivers don't take the appropriate action when given the existing signals.
6) Driversare generally of the mis-conception that flags are for their own safety and they can make a judgement when they see the reason. They're not, they're for the safety of stranded drivers and deployed marshals, and by the time they've seen those, it's too late to make that judgement.
As a footnote, I know there was a lot of discussion at the time about the flag being deployed late on drivers' right, and footage is inconclusive. However, I know from marshals on the previous post drivers' left that flags were displayed at that point. Certainly several drivers made it safely through, and that's consistent with previous incidents in the same place.
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