These wallets are good, they serve their own purpose and they're the only way we can easily transact between fiat and cryptocurrency despite being centralized.
You see, you cannot say centralized wallets are good because they support fiat, because coinbase, blockchain are usa based projects.
And on the other way around, if you say they are good for their purpose i agree.
Do not forget that you do not have access over your funds on centralized wallets; so always ensure to withdraw your funds to your paper or trezor wallets for safety