IMO I'm happy with the ref anouncing things like 'ruck' 'that's a maul' 'use it' but there should be no coaching. Takes me back to kiddies rugby, these guys are pros, the ref shouldn't be saying that.
As to thanking or praising players for pulling back from offending when told to do so by the ref - FFS
Ref coaching has been increasing massively. Ref should assess if it affects and penalise if it does.