Repeating entries is one of those features that sounds much simpler than it is to implement. The reason I haven’t prioritized it is because, in my work, it is pretty unlikely that anything truly repeats exactly from week to week. When you have a weekly meeting for example, they never start or end at the exact same time or last for the exact same duration. Since my original goal was to create a tool that gave a very accurate view of the time spent, I felt like the repeating entries would all have to be adjusted each time anyway.
That being said, if enough people can argue that this adds significant value, I will put it in (even if I wouldn’t use it myself).