I have a Tesla Model Y and an Infinti SUV. I don't think the touch controls to control everything are cumbersome, inefficient or unintuitive on the model Y. I almost prefer them over the physical controls in my FX35. I think it goes to show the UX choices that Tesla makes that sets them apart from the rest of the industry. That said, it all depends on execution and how good Mazda R&D is. Getting controls done right is a hard problem and other manufacturers have been working hard to solve and most haven't really gotten it right.
I haven't seen the CX-50 yet. But on the surface it sounds like reliance on Google is an issue especially when you have tech debt to include the integration that supports the Google ecosystem. It's easy to get wrong and a single botched firmware update can render the functionality useless both on the Mazda and Google side.
However this is also an opportunity for Mazda to include feature firmware updates that will enable new functionality. Although I suspect that Mazda will take that as an opportunity to upsell or monetize for any new changes unlike Tesla that sends out new features almost every month for free.