Does 'Next Up' behaviour not bother anyone else? Or am I missing something?

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Very true. I meant more "mix and match what exists with what they're used to coming from Plex". Here's the areas @TheDreadPirate is speaking to. 

   

   

I don't see what exists as all that different from what was described, but I can understand that with certain clients, there are limitations or when you are familiar with a software after a number of years that adjusting to a new server/client can be difficult. Spend some time with Jellyfin and how it operates and if you don't like it or have transformative feature suggestions, I definitely encourage you to submit a request.