I mostly agree with everything you wrote, except for the fact that it’s all happening at the very last minute when that money can’t realistically be used to strengthen the defense. In some crazy scenario, if that money was being used to buy someone like Bastoni, probably no one would complain. But as things stand, the money from the transfer wouldn't be used for anything smart.
At this point, this sale only makes sense if Dro or Guille are genuinely capable of replacing Fermín and I honestly don't know if that's the case.
There's the winter market. And next summer also. Need to think longer term. Midfield is looking well without Fermin also imo. How many goals did he actually score last season, or assists? I rememeber Olmo with the majority of key goals from midfield that brought many points, and Pedri. Vallecas, Palmas, Espanyol, Celta, Mallorca.
Fermin is a good player but the way some post about him you'd say he was a key contributor for us last season. He only played 1200 mins in the league and most of his goals and assists came in blowout wins.
The offensive end product of this team comes mainly from the front 3, then Olmo, then Pedri, and only then Fermin. We have 5 players who are above him in the last third in terms of influence. 6 if you count Rashford now. Hell, forgot about Torres. This makes it 7.
I guess I don't rate Fermin that highly as a deeper player. Not at the level of Olmo, or even Gavi, let alone De Jong and Pedri. For me he is a replaceable player. PSG signed Joao Neves and Vitinha for less that we could sell Fermin for. Superior players in every way. We need the same. Sell on a high and use the funds to upgrade the team with well planned signings, if not on CM then in defensive positions.