As far as which I'd take backpacking: neither. The Fenix isn't a better UX than our iPhones, and we already take battery backups for the phones + put them on airplane mode with low brightness and get ~2-4 days of battery life out of them that way (usually shutting them down completely at night). The watches aren't worth the grams yet -- it's weight I'd rather spend on a nice phone pocket for my backpack (I like the Prometheus Design Werx SPX Pouch). I'm hopeful that another year of software updates for the Ultra might fix that -- if it did have useable topo maps + dynamic offline route planning, it might be worth it.
The other big benefit I see is cellular. Now, when I go for a run / bike ride / etc I don't actually need my phone, and if I'm confident that I might stop somewhere with Apple Pay, I might not need my wallet either. Back when I was riding pretty seriously, it was common for folks to just bring their ID and some cash. I'm also excited about the prospect of using the watch as a fully-featured bike computer, given it's about the exact same size as the old Polar bike computers I used to love.
The all time high number of bitcoin network transactions in a 24h period is a bit less than 500k.
The busiest day for Bitcoin usage worldwide is roughly equivalent to the population of Modesto, CA.
Blockchain occupies so much of the conversation and generates such incredible amounts of hype very few people truly understand just how insignificant it is in terms of not only the global financial system but also the internet. As you say billions of users and billions of transactions.
It's almost as though people forget these networks are completely public and open - adoption numbers for any chain are a blockchain explorer away.