Could you show any example? I don't care whether it's on mainnet, testnet or signet.
ask nicely and you shall receive
https://www.blockchain.com/btc/block/364422its just 1 transactions and filled the block and took the nodes a heck of a long time to validate due to the bloat of soo many signatures. that prompted a change to sigops /5.. but even thats too high with the increased blocksize, so needs reducing again
I'll check it later.
taproot was not part of the protocol before X date.
the thing is though. it is not rocket science to do current height - utxo height.
it does not require a PHD in cryptography to master it.
Doing "current height - utxo height" is very easy, but it's not easy to determine whether a block is valid when each node have slightly different mempool and miner attempt to evade "coin age" rule (such as move their own UTXO).