Brighton are making smart move again, they sell Joao Pedro for 63 Million Euros and then they sign Olivier Boscagli who have 28 Million Euros market value by free transfer.
Dumfries contract ends in 2028, so there might be a chance of his exit from Inter in this window, because €25M isn't that massive, compare to what other clubs might be asking for a similar type of player.
25 Million Euros is a fair deal for him.
Not that high and not that low, his weakness is he not versatile, this might make him not able to adapt in other teams. In other teams, midfielders are people who can help to attack and defend, but Dumfries play more defensive even as a midfielder.