Double clutch transmission – Switching from D to N while driving

Hello, is it harmful for a DKG transmission, especially with the KIA Proceed Gt, in the long term if you switch again and again from D to N to be able to sail? I couldn’t find anything for this on Google, there’s nothing wrong with a guide:https://www.kceedde.com/betrieb_mit_double clutch transmission-342.html What do you think? I am currently driving a hand switch and very often insert in N so that the engine brake does not slow down the car too much. r the Kia Proceed GT and would clarify this question in advance. What do you think?