Skyforge explains tweaks to the Cathedral and the Tower of Knowledge
There are few feelings as negative as being unable to catch up. That's been a major problem with Skyforge's Tower of Knowledge for a long time. Players who were already well advanced had no problem upgrading the tower rapidly, which in turn unlocked new benefits; by contrast, new players would struggle to earn enough resources to upgrade the tower, thus falling further behind the people who were already ahead. It was one of the problems that the developers aimed to fix with the adjustments to the building last week, as explained in depth in the most recent post on the official site.
The Tower of Knowledge no longer requires credits, but instead is upgraded based on enemies defeated with a maximum cap on daily upgrades. You can also unlock powerful Prototypes from research within the tower. The Cathedral has also been improved by making it far cheaper and much more potent in its effects which avoids its previous status as the least desirable building to upgrade. So these changes are all good, unless perhaps you prided yourself on being a god of good urban planning.