As is, it appears either option works fine for anyone. The same could apply to lessor capacity versions of iPhones, iPads and Macs. So why don't we buy the cheaper, lower capacities of those other Apple products?
There is apparently dynamic "unloading" of apps stored if space would get tight, so there may be a scenario that one could never fill up a 32GB version. Conceptually, it could just delete some space hogs not being used and then re-download them again when you want to use them again. This might even seem nearly seamless (you barely notice that it's having to re-download something it chose to jettison).
I wonder if one loaded up all 32GB with big game apps, built up in-game profiles (cars you've designed, etc) and then that app gets deleted to create space for something else you want to download, would this dynamic unload store your in-game profile(s) or would you have to rebuild that car again if that was the app it chose to jettison. THAT is the kind of scenario where maybe the seemingly unlimited space of 32GB might have an issue. But then again, maybe Apple would offload an app and any in-app profiles back to the computer to which the

TV may be linked.
Nevertheless, here's a situation where
it only take $20 or so to double your storage on an Apple device. While the benefit of that extra 32GB is not obvious today, maybe it becomes obvious tomorrow... or next year.
We're a bunch of people that will drag ourselves out of bed at 3am in the morning to try to be first to give Apple >$1000 for a phone that barely does more than the phone we already have... and yet we worry about $20? We covet a $5K or more iMac Pro, see a third party offer a configuration at $1000 off and quickly call a $4K iMac Pro a "bargain..." but one Jackson is much too dear? We probably pay $5-$10 for 1 cup of coffee, etc. In short: it seems a crowd of Apple fans should be the least bit concerned over a single Twenty that buys anything tangible from Apple.
If this was like the old days with iPhone where the hop from 32GB to 64GB was $100+, then clearly that's a few more cups of coffee. But a twenty?