Well, you can trace the regular method too.

Not as efficiently and in mass. It’s like saying “you could gather personal data before the internet/social media”. Sure, there were mailing lists and some companies had personal data manually gathered but that was 0.00001% of what you can gather today for like 5$.

When it comes to data, scale and efficiency matter. As someone from a low trust country(Greece), any electronic voting is literally a threat to democracy, society and pretty much opens the window for a civil war. Which is why no political party even dares suggesting it.

And it doesnt take much for a society to become low trust, you only need 1 bad actor(game theory). Though Greece was never not a low trust society. But i think all countries would benefit from an electoral system like the greek one, where all political parties can have representatives on every ballot, there is tight control for ballot envelopes, everything is opened and counted in front of everyone, basically all political parties keep their own tallies, at a local and national level.

So if there is something fucky with the official results, it will be easily tracked and noticed. At least as long as you can have party representatives on every ballot. Obviously smaller parties cant do that. There have been conspiracy theories about neonazi votes not being counted, because literally all other parties despise them. And when i say neonazi, i dont mean “neonazi”, i mean literally a parliamentary party that had this as their symbol

https://en.wikipedia.org/wiki/Golden_Dawn_(Greece)#/media/File:Meandros_flag.svg

And their second in command has a huge swastika tattoo, etc. At least their party became illegal and its leaders spent some time in prison but that only happened after they murdered a greek. As long as they were beating and killing immigrants, they were fine.