$69 for an EV cert is the lowest price I’ve seen by at least $150–but even at that, I think it’s probably too much. The main reason I think this is covered by the article you link to, but it isn’t limited to mobile device use–even desktop browsers are moving in the same direction. But the bigger issue is that, regardless of what the browser vendors show the user, the vast majority of users don’t even notice, and of the few that do, the vast majority don’t really pay attention. Here’s another article that reaches pretty much the same conclusion:
https://scotthelme.co.uk/are-ev-certificates-worth-the-paper-theyre-written-on/
Edit: I guess, though, the question of “is it worth it” would require an understanding of how you see them adding value for you. The browser UI indication is the most obvious difference, but many CAs market a variety of other “benefits”. One that they like to focus on is a warranty, though they don’t seem to want to define very clearly what it covers (and I have yet to hear of a case where any CA’s warranty was actually used). But if you can explain what you think the EV cert might do for you, that would help us give a better idea of how beneficial it would actually be.