When you bought Tushanov and Sheppard three months ago for $1.5M+, you dediced they were worth the money you paid for them.
So you should have said market value instead of worthiness which, without further clarifications, is a completely subjective notion. Whether you can accept this or not is a different story, but it doesn't invalidate the point.
Training didn't change much and got slighthly easier, so no, it's not due to deliberate choices. Deliberate choices would reducing even more then talent pool would be to make training more difficult. No change like that happened in recent years as far as I can remember.
a) FA policy involving reducing the number of Free Agents for seasons and seasons when the numbers were collapsing = deliberate choice.
b) No increase in training speed or (meaningful) training flexibility when talent is drying up = deliberate choice.
The only thing that has been done to maintain the talent pool has been progressively increasing back the number of Free Agents from the almost no FA policy that was enacted. However, even today the criteria are likely stricter or about the same compared to when I joined 15 seasons ago (in terms of % of players joining the TL after someone quits). Because you see, the draining talent pool affects this too. Worse players on average means fewer players who qualify for free agency if the criteria stay the same.
You characterised my point as being that training got harder over the years. As everyone can tell you, in my post I never even hinted at such thing. I made the point that talent is reducing (except in bot leagues where it's always been minimal obviously) and training hasn't been changed to compensate for that. The change we got reduces the speed of training, allowing you to play a player 'less' out of position, it's placebo, it does not do anything to compensate for the loss of talent across the board.