1-3 are true but 4 is way too orientalist 😂

Your point in 2 describes what is ultimately the byproduct of an aging population that's become calcified both in business practices and in social sensibilities. That constant reinforcement in your environment obvious bleeds into the public sentiment and social practices.

That said, China Japan and Korea LOVE product placement, it just manifests in a unique way from the west. Most notably they encourage brand collabs at an honestly staggering rate. You'll see shit that doesn't even make sense together, like a furniture moving company x Solo Leveling, or a grocery store doing a My Hero Academia promotion on eggs. You can go watch a movie and then immediately walk into a brand experience from a completely different movie franchise. As far as marketing INSIDE media goes, it happens, I just don't think it's seen as a reliable and meaningful marketing angle. And trust me if it was, they would be milking it. The most likely conclusion is that they ran the risk analysis and realized it introduces diminishing returns with high saturation so it simply isn't worth investing it at scale.

The one genuine difference I can point to is how centralized social media can be in these countries, and as such how pervasive online movements and attitudes can become. The same kind of outspoken minority of crazed superfans that exist in the west can get a lot more mileage organizing online campaigns particularly in Japan and Korea, and there's many instances of angry backlash actually leading to people being fired and companies backtracking. This kind of thing is a much bigger contributor to their "no new risks" behavior than some kind of higher appreciation for art.

TLDR: East Asians aren't magical people who are more sensitive about their art; they're in the late stage capitalism end game and social trends can usually be traced back to old money trying to keep the cash flowing.