Are there any plans to offer access to YouTube TV so that I do not have to go back and forth between my Flex and smart tv?
nothing announced. if not available on the current youtube app on X1 currently, might try a modern Roku device.
Are there any plans to offer access to You Tube TV so that I do not have to go back and forth between my Flex and smart tv?
The best way to watch You Tube for: 8K, 4K, HDR, 1080p (Blu-Ray quality), is by using your "smart" television hardwired (Ethernet connection). That eliminates and RF interference in your home, nearby, that can cause any form of break-up in the streaming video and audio signals. I do not recommend using WiFi unless all equipment is close to television and placed so that nothing interferes with the wireless signal.
Any equipment placed in line between your television and the incoming Internet signal can, and will, degrade the signal and allow only a lower resolution to watch.