I'm not familiar with your examples, but NewPipe allows you to group your subscriptions and then show the latest videos from each group, sorted by upload date/t

I'm not familiar with your examples, but NewPipe allows you to group your subscriptions and then show the latest videos from each group, sorted by upload date/time (or something similar). What it misses from a usual RSS reader is the notifications (idk maybe they exist and you only have to turn them on) and the "read"/"viewed" marker.