I feel like you are being very reasonable and you are getting met with logical fallacies.
I agree with you. We don’t know what conversations were had with other teams, who was available and for what price. We also don’t know what the situation internally looks like for the player’s already on the team.
None of that negates what you are saying. The team stood pat. Everything that happens from here out this season needs to be framed from that decision.
We know that almost any player can be had for the right price, with the obvious exceptions (Mahomes, Allen, etc). We aren’t talking about the proverbial untouchables. We are talking about the middling players that other teams can replace and that are an upgrade for the Lions. They exists. Whatever the price, if discussed at all, choosing not to pay it should have an effect on our perception of the season, and the GM in particular.
Winning it all now or in the near future would obviously confirm his decision making process and put an end to this discussion. That really should go without saying. Anything less should be questioned. Not questioned in the sense of replacing anyone. The team can be wildly successful and still not win it all. Questioned in the hopes that, short of a championship, they can shift the philosophy. While sacrificing the current season’s best possible chance of success in favor of retaining the chance of future success has worked in filling the roster with talent, it hasn’t led to the ultimate goal. It hasn’t even gotten them to the Super Bowl.