You don’t have to use UTM parameters all the time and everywhere. But it is helpful to get greater granularity on how different activities are driving customer engagement. And if that is valuable to you, then you should use them. It is worth considering, that sometimes you aren’t going to act on this data, or the size of the initiative doesn’t warrant it. But given the ease of adding UTM parameters, you may as well. Its like insurance, for future you, to get better analysis of what worked and what didn’t.