Not sure what you're referring to. I've got a Roku 2 (3100X), and Netflix and YouTube work perfectly on it.
The 3100 is the Roku 2 XS. At least on the two I own, YouTube was terribly unresponsive, sometimes taking over 5 seconds to respond to a remote button press. And it would often crash during playback. Also, for local media playback, it would become overloaded with video bitrates much over 12Kbps. That's fine for a DVD rip, but required transcoding for any HD material. The 3100 only has two worthwhile features. It has a Fast Ethernet port, so didn't rely on WiFi, and the remote uses Bluetooth instead of WiFi Direct. But those two features could not overcome its other limitations. I don't use Netflix, so can't speak to how well it performed. But since it doesn't support Netflix Profiles, I would expect Netflix to drop support for it as well.
If it's still functional for you, that's great. As long as the channels still work, keep using it. But don't be surprised if channels start failing, or even disappearing from your home screen. It's a legacy player, and they won't provide any further support for it.
Roku Community Streaming Expert
Help others find this answer and click "Accept as Solution." If you appreciate my answer, maybe give me a Kudo.
Given the decision to obsolete devices that work fine, I can only say, I will not be buying another Roku. Not good for the environment.
While I can appreciate the sentiment, you're kidding yourself if you think there's some other company where you can take your business that isn't going to do (or hasn't already done) the exact same thing.