Hi Joan,
I think it's an personal choice of the player, it's his/her freedom of action. It's to the listener to judge if he/she likes it or not. More a matter of taste.
For me I sometimes think that it sounds nice. Sometimes it's a lack of technique, skills, the keyboardfeatures makes this easy for me to use the transpose function, why not using it?
For instance: I made the song 'Wheels'. It starts with F-chord. 'Normally' after some measures it changes in G-chord. In that case I have to change left and right hand playing. As an amateur I am glad that I can use the transpose function, so that I can play again the same left and right hand. An ode to the keyboard-designers for making it a little bit easier for me .
Pherhaps the more skilled players among us detest this way of working/playing, but it makes it much easier for the less skilled.
Best greetings,
Cees