I like Praise. We don’t give it often enough and if someone does something awesome like simplifying complicated tests, removing dependencies or works smart and not hard, it is due.
While the conventional comments give a nice framework, nothing stops someone from adding a cheerful gif to the body of that praise.
Even on larger reviews it is nice if you scroll through 10 nitpicks, 20 suggestions and 5 questions, if you see the occasional praise.
Though specifically for "praise:", I'm a much bigger fan of the :+1: thumbs up emoji instead which accomplishes about the same thing.
The issue is that many people seem to take code review comments extremely personally and get very upset and defensive.
Meanwhile, we rarely get upset at automated eslint warnings, compiler errors or issues found by Google PageSpeed Insights.
Sounding robotic prevents you from sounding offensive.