Rather than only uttering a blunt "wrong", I'll defend why the TNG examples I listed are of
character development. According to
TV Tropes,
Character development is, by definition, the change in characterization of a Dynamic Character, who changes over the course of a narrative. At its core, it shows a character changing. Most narrative fiction in any media will feature some display of this.
Family: Picard has an emotional breakdown over having been forced by the Borg to kill. In the process, he and his brother are able to reconcile their differences. Having been assimilated is something that will repeatedly haunt Picard.
Brothers: This episode kicks off the emotion chip-arc, which continues in
Descent. The availability of a means to experience emotions is modification of Data's character, since up to this point, it was believed that Data could not feel emotions.
Reunion: Worf discovers that he is a father. Enraged to the point of disregarding his duties in Starfleet by the murder of K'Ehleyr, Worf seeks venegence by killing Duras. Worf bonds with Alexander. Of these four, this is probably the best example of character development. Being a father brings out new dimensions in Worf, in his scenes with Alexander.
The Wounded: O'Brien comes to terms with, and overcomes, his prejudice against Cardassians.
Being a procedural drama, instead of a serial drama, the type of development shown in TNG was of course
considerably more limited than that shown in DS9. The point I am making is that some character development occurred nevertheless. Above it was stated that no development occurred
at all in TNG. That is just not true.