There are lots of cases that require human judgement, and CodeSniffer doesn't have one.
Consistent brackets, indentation improve the code. Lack of space after commas in function call? Probably can be forgiven, but that's ERROR according to CodeSniffer.
IMHO there are way too many errors reported by CS. Even projects that appear to have neat code can easily run into thousands of CS issues. It quickly becomes tiring and nearly impossible to resolve all those issues, especially when it's a mix of real problems and obsesive-compulsive nonsense — both equally often marked as ERRORS.
You may be better off ignoring CS and spending time on actual improvements to the code (in terms of design, algorithms) rather than just completely superficial whitespace and comments changes (does 1-line isAlpha function really need 8 lines of comments? Yes, if you ask CS).
CS can too easily become turd-polishing tool.
