I guess I'm just one of those people that doesn't care about 4K. I can't tell the difference between 4k and 1080p unless they are side by side and even then, I don't really care. I'm the same about audio quality and frame rates in video games. At a certain level of quality, I just don't care that much as long as the content is good.
And, HBO Max does have good content with all of HBO plus a few Max exclusive that are very good like Doom Patrol and Raised by Wolves.