Quote from: pooya87 on Today at 05:51:55 AM

If you put the number of hashes a miner does in a second into perspective it becomes easier to figure things out. A single S19 antminer can compute 95 TH per second. That is 95,000,000,000,000 hashes per second. A block header has a nonce that can go from 0 to 4,294,967,295 that means each time the miner goes through all those nonces it has to change something else (extra nonce in coinbase transaction to run from 0 again). S19 would change extra nonce 22,118 times per second.
So basically at least a transaction in the block is changing which requires changing the merkle root hash and witness merkle root hash. Adding or changing more transactions in that block doesn't add any extra times.

Oh wow, this sums it up pretty well. I didn't realize the nonce had such a (relatively) small cap. This really helps me understand the difficulty target much better, as there are immense amounts of blocks that cannot be hashed under the difficulty target by only changing the nonce. Thank you for the intuitive reply! Thanks to everyone else who chimed in as well