Coinbase is just playing catch up at this point. They started years ahead of Binance and it's surprising how far behind they are now in comparison to Binance. Chalk it up to regulation or them just resting on their laurels, but with Binance coming up with fiat-crypto pairs and setting up their operations and banking in Malta, it will only be a matter of time before Coinbase's advantage as a fiat onramp to altcoins becomes irrelevant.
Fiat onramps will remain important because they drive the majority of mainstream adoption. Setting up a fiat on-ramp in an alternate jurisdiction invites a poker Black-Friday style government intervention (https://en.wikipedia.org/wiki/United_States_v._Scheinberg#Ac...).