Panasonic plasmas still have ridiculously good picture quality, even compared to OLED. I still have one and the only reasons I bought a new TV were size (42" is a bit small these days), old HDMI (I don't know if plasmas ever even had HDMI 2.0 ports) and lack of modern smart features.
The LG C9 I've bought has terrific picture quality for movies, but I'm just getting used to its subpar motion resolution now, almost 2 months after buying it. The bigger screen (55") and the higher resolution magnify all the shortcomings of 30fps (and lower) content. After trying this TV I think that motion resolution and upscaling quality are a priority for me, before resolution and perfect blacks. This is why I'm eyeing the Sony X900H (XH90 in Europe).
I also think I'd be more comfortable with a 48"-49" TV for my gaming. I sit back more than 2 meters from my TV but, while I appreciate the 55" size of my C9 for movies, I have trouble keeping everything under control in games like Tetris 99 because the screen is so big. Unfortunately the sub-55" segment of the TV market is almost completely neglected by producers when it comes to putting great image quality and the best gaming features in a TV. The LG CX looks like the only 48" option that has it all, but it's still a LG OLED...