⭐ Merited by vapourminer (1)
Bitcoin nodes don't need to store or provide access to historical blocks to operate. They only do today (to the extent they do, many don't) to aid new nodes coming up securely, but in the future that will be accomplished via other means because transferring terabytes of blockchain to process and throw away whenever someone starts a new node won't be sufficiently viable.
Very interesting. Is there some technology under consideration to replace the traditional "initial blockchain download", or some concrete research on one?--snip--
I skimmed page you mentioned, but none of them mentioned UTXO commitment. I remember BCH community attempt to do that, but i never check whether they actually implement and use it. Although with new ~15 million UTXO due to BRC-20 hype, i wonder how well UTXO commitment works.
Although people who don't care about verify whole blockchain or can trust certain person could just use download snapshot of pruned node from website such as https://prunednode.today/.
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In addition, ISP around the world would advertise their service with words such as "up to X Mbps". So if you get less than X, they couldn't be sued without very serious effort since they use term "up to" which is annoying.
well if you were an ISP you would do the exact same thing. You can't promise perfection. Another annoying thing these companies do is advertise their promo rates. They never want you to know what the price goes up to after that first 12 months is up. You have to probably call them and threaten to take them to court just to find out what their normal rate is... 
I get your point. But it's annoying when a customer only get less half or less of what ISP advertised most of the time.