I appreciate and agree with your comment about taste, but that's not a reason to block a merge. It's a teachable moment, though.
The reasons to block merging code should be explicitly and clearly stated in your Coding Standards documentation.
The reasons to block merging code should be explicitly and clearly stated in your Coding Standards documentation.
That said, it's also important the reviewer feels equally responsible for getting the work done and is willing to make pragmatic tradeoffs taking into account timeline pressure, how contained something is, how likely it is to actually cause trouble, how hard it is to change later. Cross-team and cross-org reviews are more likely to involve pure gatekeeping, which is death.