Bitcoin is an open to the public blockchain, you have no privacy.
This is such an invalid conclusion. Just because it's open and transparent, it doesn't mean everyone can be identified by everyone, which is how I understand "no privacy". The more careful you are, the more difficult it becomes for others to trace you.
For instance, if I reuse the same address I'm making it provable that the same person(s) have done all of those transactions. If I don't reuse addresses and avoid spending all of my UTXOs in one transaction, the thing changes. Let alone if I coinjoin, use mixers etc.
As far as verifying goes, he could use 3 separate block explorers to confirm the transactions, which will be a 3X better verification that a single node.
This is also false. The initial block download doesn't happen from just one node. I can create up to 8 full-relay outbound connections. Also, verification plays the biggest role of the whole situation. There's no trust that what you're viewing is true; you've verified that it is.
Not to mention the privacy drawbacks of handing out your transactions to block explorer(s).
You can't run a blockchain network off of only pruned nodes, so therefore aside from a propaganda feel good belief ,
they hold no real value, as real full nodes with the entire blockchain do the same plus the history since the genesis block.
I didn't say they help as much as non-pruning nodes, I just said they also do. BTW, they're both "real full nodes".