While I sort of agree with your sentiment with Güdogan, his situation was a bit different. BVB and their fans had been waiting and waiting for him to sort his situation out for a while now. The injuries and the emergence of Julian Weigl made it a bit easier to let him go. As for Güdogan who had 1 year left and still hadn't committed to a long term deal when he saw us/Pep he took his one shot, while keeping his promise of not leaving on a free like the last few.
Laporte still has some years left and doesn't want to make a big deal like Herrera did and actually has a great deal of respect for the club. So maybe if this deal goes through he will show that respect on camera then talk up the chance to advance himself as a player. With some much talent at senior level and U18-U21 in France it would serve him well to be more visible at a big club, playing in top competitions.