that could be a disaster for ethereum. IMO if the implementation of POS merge already passed so many test by various developers in the ethereum foundation but we didn't know whether there will be another new vulnerability that is still remain active or not. I meant a new code will need a very long time to search the vulnerability and when ethereum will be migrating into the POS and this will be a very big decision to take a look whether the code has no vulnerability or not. If there will be a vulnerability in the new code and when this got exploited and this will become a disaster for anyone and crypto market.
If there is one, or there will be one, then we are going to have someone fix it quickly, so by that time the problem will be how much of an impact it will have. If it is found out after a few million dollars worth of an attack then we are going to be fine, that could be recovered from and it is not a big deal.
However, if it is figured out after someone completely destroys everything and gets billions of dollars worth, since we can't really retract it and just go back, it will hurt everyone and would damage ethereum forever. This is why it is taking so long, you think it is this difficult for eth foundation to build something? They probably did it like a million times already, but they are making sure.