Are you talking about Coinbase Commerce? I wasn't clear on what new service you were talking about so I had to look it up.

I think Coinbase Commerce is an excellent concept and very relevant. I'm surprised that so far there hasn't been any other significant attempt at creating such a service. This makes cryptocurrencies more relevant as it encourages businesses to accept crypto payments and easily get involved in the crypto economy.

If you want features like limit orders etc, you're better off taking your money and assets to a dedicated exchange. There are already plenty around. Plus I'd rather trade on say Kraken's rates rather than Coinbase's.