Maybe for him, as he doesn't own a smartphone. For me, the tether introduces a lot of potential risk of not being separated far enough from your bike in a crash to trigger until it's too late (lowside or rear-end), and the cost difference is minimal (though at least the Hit-Air is meaningfully cheaper). And for me, I'm way more likely to forget to attach the tether and ride away than I am to charge the thing...
The In&Motion lasts 25 hours of riding between charges, and Astars says 30 hours. That's 3-5 days of non-Iron Butt riding, lots of time to remember to plug it in for a few hours.
The Jalopnik article suggests them sending you a bill if it goes off while you're not subscribed, which would be a collections nightmare for a small European company doing business in umpteen countries. Tracking down delinquent payers would also be borderline impossible at their scale.
I don't know what protection they offer against price increases. Seems like it would be fairly simple to lock in a price for three years, for example, and if they raise the rates after that term, you have the option to buy it out or resubscribe. They do guarantee the option to buy for $100 after three years...
It is, but you have to pay $25 USD / yr to unlock the option in the app. Same for an off-road ("Adventure") mode.
That said, when looking up the battery life, I just noticed on the Alpinestars website that they've added a track/race mode to the Tech-Air 5 vest, which totally changes the math for me. Up until now, the In&Motion was the only one that covered both modes. It's not as slick as swapping a module from a street vest into an RST suit with the airbag built in, but is definitely another option to cover both bases...