Yes quality is not raised. But imagine if you find a player in transfer list with 30/50 completed for a SA or position.

He will be more wanted by buyers, so bids may go a bit higher.

Also this does not fit to the realistic part as Alessio Fitch mentioned.
Does a player forgets of the hard training he does when he gets a transfer?

In the same way it could be that all skill points earned via training should lost after a trasnfer

I think Nordeus should look into this a bit more.