Different loads at different times and there is a thing called snow. I did a video about tilting panels in winter, it showed a neighboring town that installed grid tie to lower the electricity cost to run the sewer plant. Fixed angle with snow on top and cold temps (-20°F) led to 10 days of total lost production for that system until it finally thawed while I was producing 50 Kwh/day with clear skies and no snow on my panels.
If you are grid tie, sure, fix the angle. If off grid or maximizing off grid usage, tilting in areas of snow and cold temps may mean the difference between running a generator or switching back to grid.