lol, they have mechanism to update tx fees which results in a hardfork ...

Yeah... They instead opted for some formulaic method for determining fees:

https://docs.cardano.org/explore-cardano/fee-structure/

So it's like a fixed fee, first come first serve kinda model.

The network stopped accepting new transactions a few times due to some NFT drops clogging the network a couple years back. I dunno if they ever fixed it, but I suspect not.

