I'm using this all the time myself. There is no login to YouTube required and it supports adding subscriptions and doing everything important you can do on YouTube.
Now that's more like it. However for android Android (phone, tablet) I already have NewPipe I'm happy with. Does FreeTube work well on Android TV? I use SmartTube and it's good but it's not perfect.
I'm sorry but there likely never be a long-term alternative for free software such as this on that platform. Neither you nor the developer has much say on how to use it.