The main idea is to provide a consistent basis for correlating and analysing logs from different sources.
While this use case is particularly relevant for organisations that operate globally, it is not limited to them. For example, if some software uses local time and other software uses UTC, this can still lead to confusion or, in the worst case, incorrect conclusions when analysing logs, even if all the servers are in the same time zone. Then things like daylight saving time can also cause issues.
However, user-facing product interfaces, such as apps, dashboards or log viewers like the one in Mailcow, can (and should, imho) still display the actual time of events based on the user’s location. I don’t see this as an issue, but rather as the product working as intended.