Yeah, there perhaps may have been someone at one point who spoke to a field agent and got some bad info about readily restorable = blanket ban. However, electronic triggers on semiautos are perfectly, firmly legal. ATF Tech Branch has always consistently maintained this and there are many examples that have been for sale for years, used at Olympics, etc. Now, in the past, prices have been in the $2500-$25000 range, but there is no reason that the technology needs to be that expensive.
Another trap people fall into is "paintball" triggers. You can't have anything that stores signal information up, and then releases a burst later. It has to be strictly one-pull-one-shot, no storage of signal, no "paintball ramping" etc. Easiest way to assure legality is to have an all analog system with no microcontroller, no software in the firing system at all, which the Electronic Arms bullpup has. Now, that isn't to say the gun itself can't have a microcontroller on it, just easiest to keep out of the firing system.
The Tracking Point AR-15 has an embedded Linux computer that is wired to the trigger, so it is even possible to add software to the mix if done very carefully, but that is not the typical "rubber-stamp, it's legal" electronic trigger situation. The Tracking Point isn't so much an electronic trigger as an electronic safety release on a manual trigger. I don't know that the trigger pull is outstanding, like on the Olympic guns.
If you go to the Electronic Arms facebook page, you can see a video of the guts firing with the side-plate removed from the receiver. The guy just sneaks up on it with the edge of his finger sideways.