It not being "used" in this context is referring to it not being used as legal tender. The law that was walked back was one which had made bitcoin legal tender throughout the country. As others have mentioned, it seems to have largely failed in being adopted as such, as surveys seem to indicate that less than 10% of people in the country had used it as legal tender in the previous year.
+ By allowing 8x larger blocks (unless it's even larger now?), if in widespread use with full blocks, the blockchain would be 8x larger. Bitcoin's blockchain is already the better part of 1TB, though you can still fit that on a cheap SSD. Imagine if it were 8 and growing fast.
+ Because BCH uses the same hash algo as Bitcoin, but is much less popular, it's at risk of 51% attack.
+ Because there is no pressure on block sizes, fees are very low, which means that as halvings continue the block rewards for BCH will get extremely small. This will result in hashrate continuing to decrease, putting it at even greater risk of 51% attacks. Bitcoin's high fees allow it to remain profitable for miners even without inflation. Miners have to be paid to keep the network secure, and that's either going to come from tx fees or from inflation. BCH aims to have neither and that puts it at risk.
And anyway, there are much better solutions for day to day payments, such as Monero and Ethereum.
This has always felt like a completely weaksauce argument to me. Even with Bitcoin, very few people other than dedicated miners download a full blockchain (like it or not). 1TB is already too large to keep on your phone or laptop, but 8TB is at most a minor inconvenience on a server or dedicated mining rig. What's the demographic where a measly factor of 8 makes a difference?
I'm gonna have to ask for evidence on this one, I strongly believe most full nodes are not mining pools. http://bitdash.io/ says there are ~10,000 running full nodes, yet there are only ~100 mining pools that have produced a block in recent history: https://miningpoolstats.stream/bitcoin
> 1TB is already too large to keep on your phone or laptop
On your phone, sure. But my desktop already has a few TB of storage. But not 8. And Bitcoin Cash supporters usually seem to indicate that they'd increase it beyond 8 if the 8mb blocks filled up.
The only ones who need to have full blockchain nodes are the miners, and for them it’s just another disk in their data center.
Bitcoin has only failed so far as a replacement for Visa and Mastercard. So no, nobody's using it to buy coffee.