The groups that have trouble turning out - because they're poor, working two jobs, got no car, got poor public transport because they live in the bad side of town, they speak a minority language - those are the same groups that are likely to find digital stuff inaccessible.
It's often targeted at young voters, because they're "tech savy" so we should "speak their language". Despite the vast majority not being poor and having lots of free time they can't be bothered to vote today, why would this change anything?
Strengthening voter enfranchisement is a commendable cause, but moving from accessible to effortless in order to cater to people reasonably able but insufficiently motivated is an awful reason to jeopardize the stakes of not just electronic but outright online voting.
If you could vote through any 'device', the transportation, time, and money (depending on how the device aspect works) arguments would largely be moot.
Define minority language people? Spanish (primary) speakers in the US are more tech savvy than maybe we're giving them credit for.
Will they find a basic (/old/cheap) smartphone more inaccessible than voting in person? A smartphone is pretty necessary these days, and basic ones are often free on cheap plans.
The groups that have trouble turning out - because they're poor, working two jobs, got no car, got poor public transport because they live in the bad side of town, they speak a minority language - those are the same groups that are likely to find digital stuff inaccessible.