When finally the majority of the nodes support full RBF, chain congestion isn't gonna be as big a problem. Bumping fees using CPFP can only be done by the spender, and RBF depends on the transaction having it enabled.
I got a not tiny spend made on my behalf by a custodian get abandoned and it had no RBF enabled. It will shortly be 6 days in the mempool. There's a chance it might clear this weekend, first time it's within an hour of clearing.
But I could have had it sorted before the fees rose past 100sat/vByte if it had been RBF.
Enable RBF, upgrade your nodes, and wallet devs, make it default, dammit, so people never have to see stuck transactions they could pay to fix not arriving at addresses they control.
And it weakens the potency of any intentional or unintentional effort to DoS the chain.