If FM radio is that big of a deal, you get a different phone. Or you save that $200 and buy a small FM radio that you can throw in your pocket. Regardless, lack of an FM radio is not a $200 problem.
As for Smart Settings, I don't need to use it on the V20 to know that it works correctly. I know it works correctly. I also know it isn't any different than what I've routinely ignored in the past in my old G4 and G3. It's an embarrassingly limited app with barely any functionality, which you'd be well aware of if you ever bothered to use any of the widely available automation apps on Android. I HIGHLY recommend it.
Seriously, give it a try. Then laugh at Smart Settings. If you need help setting anything up, I'd be happy to help, but it's not complicated like Tasker. It's pretty easy to understand, assuming you're not one of those people who spend hundreds of dollars on a smartphone and doesn't know how to do anything beyond make phone calls, text, and check social media. I take it you're not since you're on this forum.
A shortcut to Google In Apps can hardly be considered missing functionality since that functionality still exists within the Google app.
Theme support is present and fully functional. Settings -> Display -> Home Screen -> Theme. No work around needed, "it just works." If this phone didn't have theme support, I would have returned it with the quickness and got the Moto Z Play.
So, again, the only actual functionality missing is the FM radio. In a real state of emergency, it's probably better to have an actual FM radio anyway, since that'll have a longer battery life than your phone.
This phone can hardly be considered gimped on Verizon considering how heavily discounted it is in comparison to other carriers or unlocked models. I've been closely following V20 forums and haven't heard much else missing except for what's noted above. If you ask me, Sprint got the short end of the stick with so many missing and hard to replace apps.
Buying the phone from Verizon is a compromise well worth it for the price, in my opinion. If it isn't, the unlocked model works for Verizon so anyone can go pay $800+ to bring their FM radio back if it's that important. Verizon is an even better deal for those of us who traded in phones during the promo period.