I have 6-year-old 4K TV, and it's already considered "too old" to get an HBO Max app. So the only way i can watch it, is to screen-share from my phone (both are Samsung), which only fills about 80% of the TV screen, the audio is slightly out-of-sync, and you can't use the phone for anything else (unlike the way I can actually "cast" from my phones for Hulu, Youtube, Netflix, and with the Vizio TV in the bedroom).
So annoying. Glad HBO Max is free with my home internet service. (Yes, I'm using it even though it flies in the face of Net Neutrality, but I'm also not cancelling another service instead...so that's me rationalizing my hypocrisy, ha!).
Why not hook up a laptop to the tv?