There are probably so many angles to this but I will give one. Netflix is more likely to be used and loved if it gives someone something similar to the thing they just finished watching (like the next episode) then if they lose them to something they might not like by giving them the opportunity to find other content.
Also even if the content is not the next episode I feel I would be more likely to go with a suggested (new) video or content rather than something that takes me time to find (and therefore in theory happier with the service). For example there are so many choices on Netflix that I find I often might decide to not even take a look because of what I think the content is. [1]
[1] An example of this is the most excellent (now in S3) 'Money Heist'. The Dali masks were an instant turnoff for me that for whatever reason (rightly or wrongly) made me think it was some kind of fantasy rather than a crime drama (not saying my thoughts were right but that is what I thought).
Also even if the content is not the next episode I feel I would be more likely to go with a suggested (new) video or content rather than something that takes me time to find (and therefore in theory happier with the service). For example there are so many choices on Netflix that I find I often might decide to not even take a look because of what I think the content is. [1]
[1] An example of this is the most excellent (now in S3) 'Money Heist'. The Dali masks were an instant turnoff for me that for whatever reason (rightly or wrongly) made me think it was some kind of fantasy rather than a crime drama (not saying my thoughts were right but that is what I thought).