[noggin]

Rule #1 - don't try and do everything on the one device.

Rule #2 - even though NAS (Network Access Storage) is initially expensive, it can work out as a much simpler setup for Networked media players and downloaded storage in the long term.
More modern LINUX NAS these days can run torrent programs, OTA Broadcasts TV servers, all sort of things. They are a type of Mini PC, and most well known brands are pretty user friendly.

Ruke #3 - That then frees you up to pick any sort of Networked Media player you like, Nvidia Shield, Apple TV, Amazon FireTV Stick, LibreELEC, CoreELEC, Vero 4k+, Windows device etc

👆THIS 👆 

I'd also go as far as to add a Rule 4.

Rule #4 - Consider whether you are best with two separate media player solutions - one for your DRM-ed streaming platforms (Netflix, Amazon Prime Video, HBO, Viaplay, C More etc. etc.) and a separate one for local media playback, Live TV/PVR etc. in Kodi.    

This is what I have done.
To save money I will keep my Minix U1 for Kodi, and use an Amazon fire stick for prime movies and tv shows (glad I kept the stick)
They both work perfectly on the same network.   

Yes - my only comment is that I wouldn't recommend the Amazon Fire TV sticks for Netflix, as that, last time I checked, the Netflix app doesn't support refresh rate switching, so all Netflix content (most of which is either 23.976 or 25fps) is output at 60fps with judder.  The same is true of the BBC iPlayer app (which is a very popular service in the UK)  

Amazon Prime Video IS output correctly with refresh rate switching - so 23.976 and 25fps Amazon content is output at the correct refresh rate.  If you only want the Fire TV for Amazon Prime Video - you're good to go.