I think they can but they just don't have the capacity to do - my assumption at least. Someone posted here that had their interview today was told to expect an oath by July at the earliest - and today's May 1. That is a clear backlog..
Yes. The same situation when test started, everyone was getting interviews, DM and Oaths quickly.
Now with many more tested files in queue, higher number of interviews than before, and higher number of DMs, there is going to be a pile of Oath ready files as well.
I am expecting a little different approach in coming months, particularly beyond July, when most of Ontario will be vaccinated and have at least received first dose, IRCC may instead open offices to administer in person Oaths. I expect August/September will be the likely timefame for in person Oaths. To that end, whilst Scarborough will most likely continue virtual Oaths alongside, Mississauga and other GTA offices will resume larger citizenship ceremonies from September onwards.
All in all, by last quarter of 2021, we will see some glimpse of light with some to the most IRCC offices conducting in person test and Oaths.