Short distance bad for diesel?

Hello all, I would like to hear your opinion about the following problem: I would like to have the new A3, I drove both the 2.0FSI and the 2.0TDI From the engine, spritziness the diesel absolutely tells me. Now the problem: Since my wife drives the car to 85%(I have a company car) she drives so max.30KM a day with it. Yes now you can say why then a car and even more so an expensive one. We leave all this out (purchase, tax), it is harmful for the I always only drive so short distances? On weekends we will of course drive more with it. I would like to know that from you. In advance thank you Gruss Michael