POW has attack vectors.

clogging the mempools with ordinals and hashrate manipulation is being done as I type.

I am a fan of POW not pos but POW has flaws.

POS is simply a terrible idea 💡.

You are right, ordinals spam has proven to be a big issue for Bitcoin and tx fees were very high when it ordinals was very famous.
I hope it will stay like right now because transaction fees are back to normal.