Should I get a CS PhD if I'm only interested in industry research?
Having a PhD or other Research Doctorate will definitely help you with many large companies. At some companies there is a fairly large gap between what someone with a degree can do and earn and someone without. "Senior Scientist" may only be open to PhD holders for example. 

Moreover, some companies really need people on the cutting edge of research. Think Alphabet/Google here and similar data and algorithm driven places. 

But I'm speaking of large and established companies. IBM, Bell Labs, and such. It may not be quite as valuable with newer companies and probably not at all with startups. But, large companies can support large scale research that may take a while to mature. They can offer a stability of employment similar to that available in an academic position.