Then they'd get the AM4 and pay less.
That is the point I am making
If they get AM4 over TR4 then that is affecting TR4 sales.
...and save some money. I don't see that this is an issue. In fact it was exactly my point - if you need HEDT you'll buy TR regardless of Ryzen's core count. If you don't, the extra cores are a nice bonus but not the reason you chose the proc.
Why ? So if someone for example wanted to edit and render videos for Youtube why spend xxx more on a TR4 setup when you can get the same thing cheaper on AM4 ? They are more or less making AM4 into a HEDT if they release a 16 core cpu.
Many people don't game at all, and may even use their PCs for actual work. A shock, I know.
That is what TR4 is for.
A bit of a non-issue really tbf. How many Z270 boards could handle Coffee Lake? Many AM4 boards are epically over-engineered (Asus CHVII, Gigabyte Aorus, and the Asrock TaiChi has 16 power phases(!)), and those that aren't still have a shot at running the next gen CPU, even if it means less of an XFR boost. Not really grounds for complaint when the competition would generally enforce a board upgrade anyway.
Except it is an issue if you already own a board that doesn't have great VRM's and want to upgrade to a higher core count cpu. That would mean having to buy a new board. Not everyone is running a Crosshair Vii or Gaming 7 etc.