That is probably the long and short of it. Patience.all we can really do is wait..
As I recall, some forum participants were warning that the change in rules would result in a huge surge in applications, which invariably would be compounded by IRCC personnel faced with a learning curve, so some wrinkles in the process could be expected for those who rushed to apply soon after the changes took effect. Appears they were not far off. My sense is that no power of prophesy of Biblical proportion was necessary.
Did someone mention something about exercising some patience?
For context, dig back into discussions about applications made in, say, 2011, and look at their timeline. These days many applicants are taking the oath YEARS sooner than many of those applicants were scheduled for the test and interview.