Yes, we have a repeat of the 4 cores period, that's what I am saying from the beginning. And because, as you say, things don't scale infinitely, those growing numbers of E cores will be more or less a illusion of performance advance. People asking for more P cores will have to turn to the HEDT platform. Especially if the mainstream market starts going in the wrong direction with E cores replacing P cores in the lid-low end market. I doubt AMD will keep offering 16 P cores in the mainstream market. After Intel starts selling 8+16 configurations, AMD will be unable to keep selling a 16 P cores mainstream chip at profit margins that will be making sense to them.
And people DO buy, even of a small performance gain, or better temps, or better overclockability. Intel's income and profit margins those years that it was selling Quad i7s proves that.
If people DO buy, then they buy. What are we going to do about it? Companies compete, and right now Intel and AMD 'compete'. This might nudge certain releases in certain directions as they fight for attention.
This is ALL business as usual.. You apply this to 'core counts and configurations' but this is the world we live in man. It happens with everything and we dubbed it progress.
There are alternatives, most of which are state controlled companies, collectivism over individualism, etc. Some call it socialism. Others call it regulation. We are living in liberal democracies though - and those are clearly past expiry date or close to it. Yes. All systems, all power corrupts. It just takes time, sometimes it takes longer. Then you get a big bang/conflict and we start thinking straight again. You might have read the news about Ukraine lately. Case in point. Its the old sovjet vs capitalism battle all over again and its clear the best our liberal democracies have against that is 'we'll try to avoid this bullet'. Weakness.
But I'm not seeing a big conspiracy regarding 'le core' because we're now getting different core types. That's just going way too deep into that rabbit hole of nonsensical details. In the end, we buy things because we need them, or because we want them. There are hundreds of aspects connected to the amount of progress we see per generation, and companies like Intel certainly do not control all of them.
But one thing stands though... over decades of development and despite stagnant periods the performance was always going up and MSDT has clawed more and more share away from higher segments of the market. If there is any constant in semiconductors, it is exactly that. Why would that change now, because we've reached a supposed 'top'? The only likely way forward is that segments will become irrelevant or differentiate on different things, like you correctly said, like temps, power usage, etc.
Markets that show the opposite of progress die. Its just that simple. Nobody wants to take a step back, and definitely not while spending money.