No, adding a new Roku to your user account does not affect your existing player(s). Roku often offers upgrades to users, but their existing devices will still work as they currently do. Of course, as devices age they become less capable of working with newer channels, often not supported at all by some channels. But the devices themselves are still usable.
Years ago I received an offer to upgrade to the new Roku 4, which I did. But my old 2 XS players still worked (and still do, except they simply can't work with some channels any longer). Same when I upgraded from my 4 to my first Ultra. My 4 is still in use by my granddaughter.
Dan
Roku Community Streaming Expert
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