Condolences to you and your family for your loss. It's my opinion that it's best not to suffer.
I just spent the past 6 years watching my wife battle cancer. They were very ominous years. We squandered away any benefit that may have been available to us. We never had that final heart to heart talk where we praise, reminisce, apologize and promise.
In the end, the cancer had spread to her brain and had a negative effect on her sanity. I dont know how else to explain her behavior towards me and the relationships I have with our sons.
In hindsight I think everything would have been better off had it gone the same way it did for your uncle but on the same day it did for her. Or your uncle. That would have given her a couple more months.
I feel that death is only a tragedy for the survivors. If we spend eternity in peace with our loved ones, when we reunite, it won't matter how much time had passed. Even if it was a thousand years, that's just a drop in the bucket compared to eternity