So I read that short clauses taking commas is a style choice but preferably the use of a semi-colon, full stop, conjunction is accurate. As in:
Experts teach; peers comfort (or and).
But if for example you had:
Donna's good at football, she's always scoring goals.
Joey's so good at football, he's talented.
Donna's great, she's a star.
Do these fall into the same rules? You see this usage informally from time to time.
Can he's and she's not act as a conjunction in these instances?