I thought the answer was yes. Threads on this site in indicate the answer is yes....but then I frequently see constructions like this on news sites from writers I'd assume would be implementing language's best practices. Here is an example I came across while reading in article in CNN this morning:
"The country is notoriously difficult to get information on and its sanctions-hit economy is said to operate on a number of different levels, including a black market, with the government not even releasing official trade statistics."
I've seen this on many, many occasions. Either my understanding of independent clauses isn't correct or there's some rule I'm not aware of. While browsing for an answer in existing threads, I saw the concept of connecting clauses brought up a few times. Some respondents said that you don't need a comma before 'and' if the next complete idea is hinged on the same verb as the preceding one? Or something like that. I didn't entirely understand but wonder if this is an example of that.
Thanks you for your time.