The comparison with online shopping doesn’t work. There were clear economic, operational and consumer advantages to online shopping, even before all the technical infrastructure for security and payments were in place; those advantages just weren’t as clear for incumbents, or for those stuck in the brick-and-mortar retail way of thinking.
Online voting isn’t primarily an economic concern, though, it’s a democratic one, so the stakes are very different. This means the customers that can be served by voting tech companies is tiny, and very insular, compared with the consumer marketplace, which means there isn’t enough pressure on them to excel at their jobs.
I’m very comfortable in saying “hell, no” to pretty much all voting tech beyond paper, because none of it is anywhere near good enough to justify a switch from something that works well enough.