I wouldn't be that harsh. even if it doesn't support cancellation today the support can be added later, eg through an optional CancellationToken parameter. This

I wouldn't be that harsh. even if it doesn't support cancellation today the support can be added later, eg through an optional CancellationToken parameter. This is eg how .Net Apis have added cancellation support. I would agree that cancellation would be good to have for lots of applications, but others will also be fine without it