There's definitely a lot to good code reviews. One addition perspective I've started taking that I haven't seen so far in the comments is a "Have you considered

There's definitely a lot to good code reviews. One addition perspective I've started taking that I haven't seen so far in the comments is a "Have you considered this alternative approach type question". And to describe the alternative, show it, etc. And this ensures there is an option to basically reject the suggestion, a valid response is I've considered and rejected that idea or approach.