It’s not impossible to recreate bitcoin’s proof of work mechanism in fact many have already done so.

To name a few: there are litecoin, dogecoin, monero and many others. The difference is that they are just utilized differently than bitcoin as they were created with different purposes in mind. What you can not recreate is bitcoin’s success. Being the first among many, bitcoin has the advantage of comfidence and reliability.

Resilience is also a feature that not a lot of coins have that only bitcoin has managed to exhibit over the years.