Just buy an LG and use an external media device. LG TVs work perfectly fine with no network connection and you can set them to power on and go straight to the last used HDMI input.

I never see the built-in OS on my LG OLED.

My understanding is that Apple have implemented RCS, which funnily enough, does not even support encryption yet. Google had to roll their own proprietary add-on.

https://www.macrumors.com/2024/09/18/end-to-end-encryption-rcs-messages/