There are two things wrong with that statement. First, you are assuming a bigger monitor is better. Technically speaking, there is nothing to suggest it is. Bigger does not mean better quality, better image, longer life/better reliability, better efficiency, or whatever else you deem represents "better".
Otherwise, it is totally subjective. YOU may prefer a bigger monitor, but that does not suggest everyone else does. For example, I have a hutch on my desk. My two 24in monitors fit perfectly under it. I could fit 27" monitors "IF" they had height adjustment stands, but then my center channel speaker for my surround sound system would not fit under the monitors. It would have to sit behind the monitors where the sound would be blocked. That would be unacceptable
for me.
24" inch is also the perfect size
for me based on the distance from my head to the screen surfaces. 32" or larger, especially in a multimonitor setup (an absolute necessity) would be too big. I'd constantly be moving my head back and forth, up and down. Not for me.
The second thing wrong with that statement is that there is ALWAYS something better coming just around the corner. So if one waits for whatever better is soon coming, they will always be waiting because as soon that thing you waited for is here, something new will be on the horizon.
So I say, when ready to buy, pull the trigger.
Nonsense. Please read what actual OLED owners have been saying before and after your post. Besides, for many users, "media" and "games" are their "normal usage".
The actual fact is, it does not matter what program is being displayed. What matters is how long a pixel is lit up with the exact same display data (color, brightness, etc.). As long as it is not constant for hours and days on end, then fine.

You don't have any teenaged kids (or grandkids) do you? If they could get away with it, their screens would be lit up 30 hours a day. Ever heard of FOMO?